drop support for python 2.6

Author: ljiang1

.travis.yml

@@ -37,7 +37,6 @@ language: python
 
 python:
   - "2.7"
-  - "2.6"
 
 install: "pip install unittest2"
 

README.md

@@ -36,7 +36,7 @@ Here's what you need to get going with the Splunk SDK for Python.
 
 #### Python
 
-The Splunk SDK for Python requires Python 2.6+. 
+The Splunk SDK for Python requires Python 2.7+. 
 
 #### Splunk
 
@@ -168,9 +168,7 @@ prompt in the **/splunk-sdk-python/tests** subdirectory and enter:
     python test_app.py
 
 The test suite uses Python's standard library and the built-in `unittest` 
-library. If you're using Python 2.7, you're all set. However, if you are using 
-Python 2.6, you'll also need to install the `unittest2` library to
-get the additional features that were added to Python 2.7.
+library. 
 
 You can read more about our testing framework on
 [GitHub](https://github.com/splunk/splunk-sdk-python/tree/master/tests).
@@ -315,7 +313,3 @@ You can reach the Developer Platform team at _devinfo@splunk.com_.
 The Splunk Software Development Kit for Python is licensed under the Apache
 License 2.0. Details can be found in the file LICENSE.
 
-For compatibility with Python 2.6, The Splunk Software Development Kit
-for Python ships with ordereddict.py from the ordereddict package on
-[PyPI](http://pypi.python.org/pypi/ordereddict/1.1), which is licensed
-under the MIT license (see the top of splunklib/ordereddict.py).