Dvc

* gdrive: Init drive if corpora property value requested. (3252) MaxRis
* UI progress cleanup (2846) casperdcl

* Set corpora and driveId params values based on type of remote disk - shared or user's. (3239) MaxRis
* config: verify before saving a modification (3193) mroutis
* erepo: make it better (3234) Suor

* push: improve 'no remote specified' hint (3213) fabiosantoscode
* Remove usage of google-api-python-client deps (3232) MaxRis
* install: post-checkout: run only on branches/tags (3228) efiop
* remote: verify cache exists on dir checksum (3225) pared
* some doc link fixes (3231) pared
* erepo: pull each time (3227) Suor

* import-url: test: prevent in-repo testing (3224) pared
* Update Google Project credentials to run tests (3216) MaxRis
* api: fallback to external_repo if not a DVC repository (3222) skshetry
* dvc: add sanity checks for hard/symlinks (3088) efiop
* tests: replace spy() with pytest-mock spy (3208) fabiosantoscode
* hooks: checkout: fix incorrect dvc repo detection (3223) efiop
* get: copy edits aroud --show-url, "dvc", et al. (3220) jorgeorpinel
* get/imp: update help output descriptions (3214) jorgeorpinel
* another attempt at travis dpl snap (3212) casperdcl
* brancher: do not get tree if there's no revs (3211) skshetry
* fetch: trust remote checksums (3200) pared
* fix snap stable & edge release errors (3209) casperdcl
* test: add git_dir (3206) Suor
* erepo: fix DependencyREPO schema (3204) efiop
* exception: fix spelling (3205) skshetry

* dvc: replace flatten_dict with flatten_json (3202) efiop
* gdrive: allow configuring no_traverse (3201) efiop
* py2: remove use of `six` (3199) skshetry
* test: refactor tmp_dir/erepo_dir (3197) Suor
* external: refactor external_repo() and its users (3190) Suor
* add snap tests (2956) casperdcl

* logger: remote: use lazy formatting (3178) efiop
* pull: treat HTTP redirects without Location header as error (3169) fabiosantoscode
* api: better code documentation (3130) jorgeorpinel
* Fix import issue without remote config in the target (3120) sharidas
* completion: get --show-url (3188) mroutis
* s3: import boto3 inside _copy instead of module level (3195) mroutis
* Restyle s3: copy large objects without chunking (3187) restyled-io
* utils: resolve_output: normpath before extracting basename (3170) pared
* get: implement --show-url to display only url/path to remote (3156) skshetry
* setup: remove py2 backports (3165) mroutis
* minor comments (3173) casperdcl
* Perf improvement for file copies (3135) rxxg
* status: implement support for imported files (3150) fabiosantoscode
* conftest: remove dvc_repo, erepo, git, git_erepo (3142) pared
* point to troubleshooting guide on too many open files error (3017) pared
* major deploy tidy (3158) casperdcl
* api: identify local repos with os.path.exists (3166) mroutis
* remote: config checksum_jobs (3133) JIoJIaJIu
* Fix gdrive multiple parents file list query (3163) MaxRis
* dvc: use pydrive2 instead of pydrive (3161) efiop
* import: don't forget to set rev_lock for git files (3151) efiop
* travis: build snap in parallel with other packages (3145) efiop
* test: use helper remotes in external repro (3149) skshetry
* test: use helper remotes in child classes of TestDataCloudCLIBase (3148) skshetry
* fs: tests: remove repo_dir (3146) pared
* ssh: test: unit, utils: test: unit: remove repo_dir (3147) pared
* connection: test: unit: remove repo_dir (3143) pared
* test: use helper remotes in TestCases (3136) skshetry
* tests: repro: unit: migrate to dir helpers (3138) pared
* tests: run: unit: migrate to dir helpers (3139) pared
* update: tests: unit: migrate to dir helpers (3141) pared
* stage: tests: unit: migrate to dir helpers (3140) pared
* tests: local: unit: migrate to dir helpers (3137) pared
* metrics: introduce `diff` (3051) efiop