Add mount

[diegohaz]

Fix #9

[codecov-io]

Codecov Report

Merging #16 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #16   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           5      6    +1     
  Lines          74    103   +29     
  Branches       19     28    +9     
=====================================
+ Hits           74    103   +29

Impacted Files	Coverage Δ
src/mount.js	100% <100%> (ø)

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