Drop python 2.6 support

Author: percyperez

.travis.yml

@@ -8,7 +8,6 @@ env:
   - TOX_ENV=py34
   - TOX_ENV=py33
   - TOX_ENV=py27
-  - TOX_ENV=py26
   - TOX_ENV=docs
 install:
   - pip install coveralls tox

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = pypy,py35,py34,py33,py27,py26,docs
+envlist = pypy,py35,py34,py33,py27,docs
 
 [testenv]
 commands = coverage run --source=fitbit setup.py test
@@ -20,9 +20,6 @@ basepython = python3.3
 [testenv:py27]
 basepython = python2.7
 
-[testenv:py26]
-basepython = python2.6
-
 [testenv:docs]
 basepython = python3.4
 commands = sphinx-build -W -b html docs docs/_build