Replace lhttpc by fusco

Conflicts:
	rebar.config
	src/escalus_bosh.erl
Support functions to deal with replies and connection information

Conflicts:
	src/escalus_bosh.erl
Fix fusco call
Use Fusco Client Pool

* Allows two HTTP connections for BOSH
Update .travis.yml
Merge pull request #18 from dcorbacho/fusco

Fusco
Use wsecli 1.1.1 and don't explicitly depend on wsock anymore

wsecli 1.1.1 fetches wsock 1.1.5 which is the Dialyzer-OK version.
Change fusco dependency to esl/fusco
Adjust otp version requirements to match 17
Run Dialyzer on Travis
Build just R16B02 on Travis for the moment
Try using pregenerated PLTs
Add omitted get-otp-version script
Echo Makefile commands
Make the Makefile a bit more verbose
Try with explicit call to escript
Use otp_release and don't be explicit about escript
Cleanup the PLT rule
Use Travis specific PLTs
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