Add Makefile and improve readme.
Merge pull request #5 from frankban/doc-exp

Add Makefile and improve readme.
Update 'go get' instructions.
charmstore: simplify serving code somewhat
Merge pull request #11 from rogpeppe/001-simplify-serve

charmstore: simplify serving code
Merge pull request #8 from bac/readme

Update 'go get' instructions.

Update instructions for use of 'go get'.  The -t causes test dependencies to be fetched. The '...' allows all dependencies to be fetched.

The original intent may have been to not use '...' but rely on the use of godeps to get everything at the correct version. Unfortunately it did not work as it didn't fetch missing packages.