Blackmamba

* Installation command is copied to the clipboard when the alert about
new version is shown. Just open console and paste it.
* `system.Pythonista` and `system.iOS` decorator to limit functions
execution under the specific Pythonista & iOS versions.
* 0.0.17 skipped, because this version was used for testing & fixing pip
* Outline Quickly... (`Cmd Shift L`) introduced

* Allow to start Black Mamba even in untested version of Pythonista, just
warn the user
* Init messages are colored (orange=warn, red=error)
* All print messages replaced with `log.info` (`.error`, `.warn`)
* `bm.log.level` allows to set logging level (default `INFO`)
* Do not bother user with alert about new version (just use console)
in case the Black Mamba is not installed via installer (git for example)
* Tested with latest Pythonista beta (3.1.1 - 311008)

* Fix HUD message when there're no tests in the file
* Removed unreliable PyPI package installation option
* Removed package from PyPI
* Custom installer alla StaSh
* Removed `settings` module (moved to respective modules)
* Removed `script_picker.py` (merged to `file_picker.py`)
* Updated `pythonista_startup.py` sample
* Pythonista version compatibility check

* Since 0.0.14, the license was to changed to MIT
* Seems no one does use PyPI for installation, .pyui files are now included :)
* Comment line with ` ` instead of just `` (12)
* `Ctrl Tab` (or `Cmd Shift ]`) selects next tab
* `Ctrl Shift Tab` (or `Cmd Shift [`) selects previous tab
* `Cmd 1..9` selects specific tab
* EXPERIMENTAL `Cmd U` to run unit tests (works, but sometimes, use at your
own risk)

* flake8 checks on Travis CI (thanks to cclauss)
* Fixed all style issues from flake8 report, down to zero now
* Analyzer removes trailing white spaces & trailing blank lines
before analysis is started (can be turned off via `bm.settings...`)
* Fixed toggle comments script (5)
* Fixed file matching in Open Quickly... (10)
* Fixed Esc key code (27 = X, not Esc, Esc = 41) (11)

* Analyze renamed to Analyze & Check Style
* Analyzer now runs both pyflakes & pep8 code style checks
* Analyzer behavior can be modified via `bm.settings.ANALYZER_*`
* Analyzer always scrolls to the first issue
* Analyzer shows HUD only if there're no issues
* `Cmd Shift K` introduced to clear annotations