Merge remote-tracking branch 'sokra/master'
Bump version number to 0.1.10. Add contributors from Github.
fix generated mappings for SourceNode
will not generate empty mappings if no source file mapping is active
one more test for empty mappings
added support for original identifier to SourceNode
Merge branch 'source-node-empty-mapping-fix'
expose sourceRoot of SourceMapConsumer
added SourceMapGenerator.fromSourceMap
added SourceMapGenerator.applySourceMap
Merge branch 'source-map-gen-apply-map'
added SourceMap combine test