Added environment attribute to the pip class which allows for users to override environment variables like LD_LIBRARY_PATH and ORACLE_HOME which are needed to install packages like cx_Oracle.
Added environment attribute to the pip class which allows for users to override environment variables like LD_LIBRARY_PATH and ORACLE_HOME which are needed to install packages like cx_Oracle.

vmfarms/puppet-python,ody/puppet-python,skpy/puppet-python,xaque208/puppet-python,xaque208/puppet-python,stankevich/puppet-python,vmfarms/puppet-python,vicinus/puppet-python,ody/puppet-python,skpy/puppet-python,ghoneycutt/puppet-python,stankevich/puppet-python,ghoneycutt/puppet-python,vicinus/puppet-python,xaque208/puppet-python