Add browser support

[mfellner]

Support the browser by splitting the code base into a version for node.js (main) and webpack/browserify (browser).

[codecov-io]

Codecov Report

Merging #9 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master     #9   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           1      3    +2     
  Lines         182    187    +5     
  Branches       43     43           
=====================================
+ Hits          182    187    +5

Impacted Files	Coverage Δ
src/TypeConfNode.ts	100% <100%> (ø)
src/TypeConf.ts	100% <100%> (ø)
src/util.ts	100% <100%> (ø)

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