*temporary* solution to #136, need to come up with a better text and place
temporary fix to comply with https://help.github.com/articles/github-terms-of-service/
fixed the fix: 21000000*1e8 satoshis will never exist
Developers must opt-in to receive tips.
Allow projects to be blacklisted for tips.
supress visibility of unclaimed tips issue #146

* filtered all Tips relations through the Tips:with_address scope
      except for UsersController#show (private page)
* filtered users with zero withdrawn_amount in UsersController#index
* removed :no_bitcoin_address message from Tips#index

NOTES:

i do not have a full setup (blockchain account , etc) so i could not test this feature manually - it was implemented driven by cucumber tests which are not included in this PR because they were implemented on the tip of my HEAD using an incompatible routing/testing scheme implemented in PR #141 and would cause travis to fail today - they are included in PR #142 along with tests for several other recent features pending merge of the new pretty url routing scheme

regarding the TipsController#index action switched on no params -
  # the original query
  Tip.includes(:user , :project)
  # the replacement query
  Tip.with_address.includes(:project)
the Tips:with_address scope joins(:user) so this should not have broken anything but unfortunately no tests exist for the Tips view so this should be verified manually on a staging system

rearding the UsersController#index action -
im a bit uncertain of the semantics here but the User :withdrawn_amount is based on the tips.paid scope which is based on the existence of a :sendmany_id - so im assuming that this means that a tip that was offered to someone without bitcoin_address would not have a sendmany_id and any so such user would have a zero withdrawn_amount
Merge pull request #168 from adamtanner/developer-opt-in

Developers must opt-in to receive tips.
fixed tests
Merge pull request #172 from bits4commits/supress-unclaimed-tips-visibility

supress visibility of unclaimed tips (issue #146)
Merge pull request #163 from adamtanner/blacklist

Allow projects to be blacklisted for tips.
fixed projects#index
fixed projects#search
blacklisted joomla/joomla-cms, lavagetto/* and jplana/python-etcd
solved #169 and #170
typo. fixes #153
fixing #173
fixing #174