Move _Proj4Projection out of _epsg

Move _Proj4Projection out of _epsg so that it doesn't have an implicit requirement for pyepsg any more (and it probably didn't really belong there anyway)
Add a unit test for proj4

Add a unit test for proj4 that's basically copying the unit test from epsg, without the requirement for pyepsg

Signed-off-by: Henry Walshaw <henry.walshaw@gmail.com>
Add myself to contributors list

Add myself to the contributors list