Merge pull request #8 from astrofrog/oo-refactor

Refactor to define and use Path
wcspath added
added pvregions, which work with my version of pyregion at least
updated some features...
fixed which init was edited
partially functional!!!
added a tests.reg region file centered in W51 for testing the ds9
regions
added a header for WCS testing
bugfixes: WCSpath confirmed to work!!
added a test it doesn't work but it tries so hard
added init to test
add successfull test
minor modifications
added a script; untested so far
added a script; untested so far
add ds9 scripts!!
installer for scripts, lots of little bug fixes etc
extract slice hdu stuff
add some notes in the extractor (and order=0)
Merge pull request #10 from keflavich/ds9regions

DS9 regions -> WCS path