Initial implementation of HTTP mock testing framework (#310)

* Initial implementation of HTTP mock testing framework

Convert to VCR testing server. Segregate live testing via build tags.

Converted Binance to VCR server

Convert Bitstamp to VCR mocking tests

Added VCR mock testing for localbitcoins

* Add server generation for concurrent testing

* Fix linter issues

* Fix linter issue

* fix race - potentially

* revert auto assigning of host vals

* Fix requested changes

* Adds mock testing for ANX
Switch to using TestMain functionality
Added cron job usage for travis-ci to live testing
Added appveyor scheduled build check for live testing

* WOOPS

* silly correction

* Fixes fantastic linter issues

* fixed another whoopsie

* WOOO!

* Adds gemini mock testing with additional fixes

* Add docs and sharedvalue

* Added tls using httptest package

* Fixed issues

* added explicit mock recording reference to error

* Fix requested changes

* strip port from mock files as they are not needed on tls server

* Change incorrect names

* fix requested changes

* lbank update

* Fix another issue

* Updated readme

testdata/http_mock/exclusion.json

@@ -0,0 +1,19 @@
+{
+ "headers": [
+  "Key",
+  "X-Mbx-Apikey",
+  "Rest-Key",
+  "Apiauth-Key",
+  "X-Gemini-Apikey"
+ ],
+ "variables": [
+  "bsb",
+  "user",
+  "name",
+  "real_name",
+  "receiver_name",
+  "account_number",
+  "username",
+  "login"
+ ]
+}