Update README.textile

Added instructions for installing zsh (due to the problems with first time zsh users)
Update README.textile
Update rvm.plugin.zsh

Ruby 2.1.1 -> Ruby 2.1.2.
Merge pull request #2994 from admpsktt/patch-1

Update rvm.plugin.zsh
Merge pull request #2993 from mittalabhas1/master

Update README.textile
local customizations

adding rvm and alias to zshrc, updated zshrc for bin path and java_home, added rvm load function to zshrc

added git rebase shortcut

remake bin path for powerline scripts

set vim as default editor

remove path to powerline executable

remove md5 checksum alias

updates to path for chef setup
update bin path to st shortcut

adding alias for ssh to mp production servers