add bitcoin receiving address to profile
log changes to participants table
add db rule to log changes to bitcoin_address
test bitcoin.json, validate bitcoin address, and move migration to branch.sql
refactor bitcoin form to make it inline on profile page
fix javascript issue that triggers edit form on a click event (bitcoin address)
fixes https://github.com/gittip/www.gittip.com/pull/1437#issuecomment-24786372
Merging with master PR #1437 for fixing #1163
This introduces bitcoin address field in gittip profile
Merge branch 'master' of https://github.com/Solution4Future/www.gittip.com into add_bitcoin_address
add to packages python-bitcoinaddress
Merge branch 'master' into add_bitcoin_address

Conflicts:
	schema.sql
	www/%username/public.json.spt
fix to UI problems with bitcoin address
fix to tests.
update to suggestion by @zwn
Merge pull request #1814 from Solution4Future/master

add bitcoin receiving address to profile