Disclaim compatibility with Python 2.6.

Also stop running travis tests for Python 2.6.

Author: pavoljuhas

.travis.yml

@@ -8,7 +8,6 @@ os:
   - osx
 
 env:
-  - MYUSEMC=true MYPYTHON_VERSION=2.6
   - MYUSEMC=true MYPYTHON_VERSION=2.7
   - MYUSEMC=false
 
@@ -92,7 +91,4 @@ script:
 
 after_success:
   - pip install $MYPIPFLAGS codecov
-  - $NOMC || if [[ "${MYPYTHON_VERSION}" == 2.6 ]]; then
-        conda install --yes argparse;
-    fi
   - codecov

README.rst

@@ -23,7 +23,7 @@ http://diffpy.github.io/diffpy.utils.
 REQUIREMENTS
 ------------------------------------------------------------------------
 
-The diffpy.utils package requires Python 2.6 or 2.7 and the following software:
+The diffpy.utils package requires Python 2.7 and the following software:
 
 * ``setuptools``   - tools for installing Python packages
 * ``NumPy``        - library for scientific computing with Python

setup.py

@@ -97,7 +97,6 @@ def getversioncfg():
         'Operating System :: Microsoft :: Windows',
         'Operating System :: POSIX',
         'Operating System :: Unix',
-        'Programming Language :: Python :: 2.6',
         'Programming Language :: Python :: 2.7',
         'Topic :: Scientific/Engineering :: Physics',
     ],