env requirements, numpy version test, datareader import update, readme update, license update, bollinger band func()

[timothyyu]

Pull request proposal for dysonance/trendy:

trendy.py:

• Incorporated "bug in gentrends #1" PR fix by fraka6 into segtrends(). https://github.com/dysonance/Trendy/issues/1
• Moved imports to beginning of trendy.py + removed redundant imports
• Updated pandas_datareader import from pandas.io.data
• Added bbands function from kimtaesu fork (https://github.com/kimtaesu/Trendy/commit/29fc88a35f3a701b9e2c309957cb23bb6d1c9f78)

README.md:

• pandas_datareader update from pandas.io.data to pandas_datareader (https://github.com/timothyyu/Trendy/commit/d5a96953c7f2859f00477f76bcb1f4ff01b8f948) LICENSE.txt:
• Added copyright/name of original repository creator + year

NEW CHANGES:

• Added basic unit test for Numpy version 1.12.1; masked array behavior changed after 1.12.1 numpy versions, and minitrends() will fail with an index boolean error without a rewrite taking this change of behavior into account
• Created requirements.txt (pip) and environment.yml (anaconda/conda) for package requirements; current code for minitrends() requires numpy 1.12.1 or lower to function properly without a rewrite or reimplementation of local minima/maximia detection (for masked arrays)
• Added GNU GPL v2.0 file modification notices

[timothyyu]

incorporates https://github.com/dysonance/Trendy/issues/1 (already merged)