Update changelog for 1.3.0

I added everything I did for the CPAN/Perl package support, and mentioned the Python 3 compatibility tweaks. I also made every bullet capitalized for the entire changelog, because the inconsistency was bugging me. :smile:

Oh, I also changed the version of the next release to 1.3.0 from 1.2.2, since it has major new features now.
Merge pull request #66 from dan-blanchard/patch-2

Update changelog for 1.3.0
add release date, fix capitalization to be consistently lowercase
cleanup
Add pipbuild command.
Merge branch 'master' of github.com:conda/conda-build
Finish adding first draft of pipbuild
Add equality versioning to conda skeleton.  Add conda pipbuild command to conda-build package
Remove the directory created.
Fix bug when space is in package dependency.
Fix logic errors.
Don't upload unless package is built successfully.
Fixes.:
Merge branch 'master' of github.com:conda/conda-build
Stop trying if pip install fails.
Remove --personal flag from binstar upload;  Fix dependencies for bad usage of install_requires.
Clean up pipbuild.
add ability to skip binary relocation step
remove unused imports
Remove directory if build fails.