Move build.log into the build folder

Another effort to de-clutter the root folder
add transaction block helper
Merge branch 'master' into al-trans-block
changelog
merge
There are a few implicit casts stopping master from successfully testing/building in Realm.xcodeproj
Merge pull request #636 from realm/al-trans-block

Add transaction block helper
Merge pull request #637 from realm/jp-hotfix-implicit-casts

There are a few implicit casts stopping master from successfully testing/building in Realm.xcodeproj
Merge pull request #634 from realm/ez-build-log

Move build.log into the build folder
merge
bump version