Added ability to split out message/traceback when pushing to webhook. Now Slack/Discord handlers should appropriately use triple-backtick notation for messaging.
**Example:**
>[ERROR:logging_test.py--test_discord_logger:311]
>validate exc_info
python
Traceback (most recent call last):
File "~/source/ProsperCommon/test/logging_test.py", line 309, in test_discord_logger
test_dict['butts']
NameError: name 'test_dict' is not defined
The formatting behavior is not as granular with Slack. Reduced messaging complexity, but hardcoded `attachments` formatting
Fixes 11
Other Notes:
* Removed `prosper/crest` to be implemented in another library later
* Removed `prosper/common/prosper_graphing.py` because untested and unsupported
* Cleaned up `setup.py` to reduce noisy features
* Updated `README.md` to make a more beautiful landing page
* Added starting hooks for [travis-ci](https://www.travis-ci.org)