Removed invalid unittest from requirements.txt

unittest is a core module, and not installed through pip
Dammit, we will get travis working
Backport unittests2 for python 2.6 compatibility
Using unittest2 instead of unittest for Python 2.6 compat
Ignore test incompatible with 2.6
Added Travis status image
Updated version number to 1.3.1
Merge branch 'master' of github.com:joonty/vdebug
Correct check for multibyte support, fix #37

has("multibyte") is changed to has("multi_byte").
Merge branch 'master' into dev