Improve range selection zone in CSS
Block chain introduction: Use a concise summary of the system and the subsection's content
Improve block chain summary text
Merge pull request #16 from saivann/blockchainsum

Block chain introduction: Use a concise summary of the system and the subsection's content
Replace "Generation transaction" by "Coinbase transaction"
Drop duplicate examples in "Block contents"
Various fixes to suggestions by @mikehearn and @instagibbs
Merge pull request #17 from saivann/devcoinbase

Replace "Generation transaction" by "Coinbase transaction"
Merge pull request #19 from saivann/devblockexample

Drop duplicate examples in "Block contents"
Fix a link
Merge pull request #21 from harding/tx-fixes

Various fixes to suggestions by @mikehearn and @instagibbs
Merge branch 'dev' of https://github.com/saivann/bitcoin.org into wallet