Replaces the Angle parser with one written in BNF form using PLY.  Replaces the existing pyparsing-based parsers in the units package with PLY-based ones.
Fix to issue #809. Added property to meta in Table to make read-only.
Clean the projections classses, remove conic projections for now
fix projections
remove conic projections
Update compressionmodule.c

Revert a change accidentally made in 816197776000a4563710a88cf53c6a52cf56ca7f.
Merge pull request #1050 from mdboom/coordinates/angle-parser

Update the Angle parser
Merge pull request #1021 from ZachAstro/try2-fix-issue-809

Pull Request for 809 to Master
Merge pull request #1092 from nden/fix_projections

Fix projections
Addresses some of the questions in #1060.