Dynect errors were not visible in the exceptions

When DynectError was raised the error message was not shown in the backtrace.
Merge pull request #1 from dsabanin/patch-1

Dynect errors were not visible in the exceptions
Don't restrict json gem to version 1.4.6
Merge branch 'master' into with-httparty-0.5

Conflicts:
	Gemfile
	Gemfile.lock
	dynectastic.gemspec