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.

ByteInternet/puppet-python,cwood/puppet-python,adevore/puppet-python,cwood/puppet-python,derektamsen/puppet-python,petems/puppet-python,ByteInternet/puppet-python,petems/puppet-python,adevore/puppet-python