[Refs #67] Update interface labels, visual assets and code references to 'Bitcoin', 'bitcoin', 'BTC', 'PPCoin', 'PPC', and 'Peercoin' (except when the last is used in Peershares for dividend payouts)
[Refs #67] Update Qt application content and file name for Peershares
Merge branch 'peershares-rebranding'
[Refs #67] Replace UI 'wallet' references in the RPC responses with 'portfolio'
Merge pull request #90 from brossi/master

Updates for interface labels, visual assets, and code references to consistently reference Peershares