Update README.md

Info about powerline-shell under python2.6
Merge pull request #76 from tomislater/patch-1

Update README.md
Adding php_version segment
Improving php_version segment: better way to get version number
Adding ruby_version segment
Fixed php_version segment: wrong php version number when running on Ubuntu with system wide PHP installation
Merge pull request #77 from marcioAlmada/master

Adding new segments
Update patched character codes
Merge pull request #78 from sanmiguelje/master

Update Patched font Codes
Fixing #79
updated method naming and now supports showing patch levels
Merge pull request #80 from flyinprogramer/master

love and care for our ruby segment
added support for gemsets which are a thing for RVM
Merge pull request #81 from flyinprogramer/master

Adds support for gemsets which are a thing for RVM users
initial commit of colorizing by hostname feature
testing hostname coloring on other machines
Tweaking of opposite color picker, also fixed a bug causing RGB values to go over 255
Small update to the doc string at the top
actually had meant to make the normal hostname the default
Merge pull request #82 from hryanjones/master

Uniquely colorize hostname based on a hash`