Bug 784739 - Switch from NULL to nullptr in mfbt/.  r=jwalden

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extra : rebase_source : 090706fa9d97854fe3071adf037a09d914a0854f
Bug 894026 - Implement ES6 binary and octal literals.  r=till

--HG--
extra : rebase_source : 8b38dbc0f3c98f7246137d21ae9b3a29be640e2b