Update docs dependency install script for Ubuntu 14.04, also update docs...

Update docs dependency install script for Ubuntu 14.04, also update docs readme to specify Ubuntu 14.04

docs/README.md

 # Doctrine DBAL Documentation
 
-## How to Generate
+## How to Generate:
+Using Ubuntu 14.04 LTS:
 
 1. Run ./bin/install-dependencies.sh
 2. Run ./bin/generate-docs.sh

docs/bin/install-dependencies.sh

 #!/bin/bash
-sudo apt-get install python25 python25-dev texlive-full rubber
-sudo easy_install pygments
-sudo easy_install sphinx
\ No newline at end of file
+sudo apt-get update && sudo apt-get install -y python2.7 python-sphinx python-pygments
\ No newline at end of file