SourceMap support

[twada]

Adjust location information (filepath, line number) if options.sourceMap is given.

• add dependency
• spike
• adjust line number
• adjust filepath
• refactor

[coveralls]

Coverage decreased (-0.46%) when pulling 755abcc on source-map into b1d8f72 on master.

[coveralls]

Coverage decreased (-0.95%) when pulling f919d59 on source-map into b1d8f72 on master.

[coveralls]

Coverage decreased (-2.08%) when pulling 39dea3d on source-map into b1d8f72 on master.

[coveralls]

Coverage increased (+0.46%) when pulling 651e92a on source-map into b1d8f72 on master.

[coveralls]

Coverage increased (+0.46%) when pulling d4d4359 on source-map into b1d8f72 on master.

[coveralls]

Coverage increased (+0.48%) when pulling 112db8b on source-map into b1d8f72 on master.

[coveralls]

Coverage increased (+1.34%) when pulling d2cbfa5 on source-map into b1d8f72 on master.

[coveralls]

Coverage increased (+1.36%) when pulling 3fa4227 on source-map into b1d8f72 on master.

[coveralls]

Coverage increased (+1.35%) when pulling ec28a32 on source-map into b1d8f72 on master.

[coveralls]

Coverage increased (+1.35%) when pulling 0f0fa8b on source-map into b1d8f72 on master.

[coveralls]

Coverage increased (+1.35%) when pulling be2d9c1 on source-map into b1d8f72 on master.