Updated code to correctly minify the library with JSCompiler.

[TMSCH]

This required adding externs that include type definitions for interfaces that are exchanged between the client and the provider. Updated the travis script to make sure it compiles correctly.

[codecov-io]

Codecov Report

Merging #15 into master will decrease coverage by 0.01%. The diff coverage is 92.85%.

@@            Coverage Diff             @@
##           master      #15      +/-   ##
==========================================
- Coverage   78.86%   78.84%   -0.02%     
==========================================
  Files          34       34              
  Lines        1216     1234      +18     
  Branches      130      131       +1     
==========================================
+ Hits          959      973      +14     
- Misses        220      224       +4     
  Partials       37       37

Impacted Files	Coverage Δ
ts/protocol/comms.ts	88% <ø> (ø)	:arrow_up:
ts/protocol/data.ts	100% <ø> (ø)	:arrow_up:
ts/protocol/preload_request.ts	100% <ø> (ø)	:arrow_up:
ts/api/api.ts	27.73% <ø> (+5.68%)	:arrow_up:
ts/spi/spi.ts	91.66% <ø> (+5.95%)	:arrow_up:
ts/protocol/enums.ts	80% <ø> (-20%)	:arrow_down:
ts/protocol/post_messages.ts	100% <100%> (ø)	:arrow_up:
ts/protocol/rpc_messages.ts	94.54% <100%> (ø)	:arrow_up:
ts/protocol/secure_channel.ts	88.54% <100%> (ø)	:arrow_up:
ts/protocol/errors.ts	73.33% <66.66%> (ø)	:arrow_up:
... and 7 more

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[TMSCH]

Thanks Rahul and Iain!