merge. update cmake.
Manually running yasm from cmake.
Merge branch 'upstream' into develop
update boost dep for osx
only log mining message when hash changes
Revert "only log mining message when hash changes"

This reverts commit bed0539d7029260847837174fc8bde3bb0a82352.
Minor state reporting fix.
Merge branch 'up-develop' into develop
Merge pull request #56 from subtly/develop

update for osx builds
Fixup for bad -mt patch.
Safer syncing of blockchain/txqueue to state.
Linux build fix.
Avoid unnecessesasry mining messages.
Merge pull request #57 from CodeShark/secp256k1_win64

Manually running yasm from cmake.
Update README.md
Merge pull request #77 from wanderer/patch-3

Update README.md
Relative links in the README.md

If I'm not on `master` branch it doesn't make sense to link
`CodingStandards.txt` from another branch.
+ add links for `LICENSE` and `TODO`
Merge pull request #83 from mquandalle/patch-1

Relative links in the README.md
Update README.md

Correcting minor spelling errors ("formatting" and "guidelines")
Merge pull request #84 from MelissaCole/patch-1

Update README.md