Fix table of content missing or broken links
Switch to kramdown for markdown in _config.yml
Generate toc automatically
Drop "Block Validation" text (as per previous discussions)
Finished general edit by TMG

General comments to be discussed elsewhere.
Changed "satoshis" to "value"
Merge branch 'dev' of https://github.com/saivann/bitcoin.org into dev
Merge remote-tracking branch 'tgeller/dev' into dev

Conflicts:
	en/developer-guide.md

Resolved conflit by accepting one of tgeller's conflicting changes,
postponing another confliting change by putting it in a comment, and
deleting the third which was attached to definition I deleted after
tgeller forked from saivann.
Resolve merge conflict
Remove double quotes on "mutable"
Update developer-guide.md

As per discussion, break into two parts the paragraph containing "spenders propose a transaction fee"
Update developer-guide.md

s/return an item of value/send an item of value/
Merge pull request #8 from saivann/merge-tgeller

Merge tgeller's changes; reviewed by harding and saivann with additional feedback from tgeller.
Merge remote-tracking branch 'saivann/dev' into dev

Conflicts:
	en/developer-guide.md