Merge pull request #6 from obieq/multi_analysis_query

Multi analysis query
Use 1.8 hash syntax throughout README
Recognize our awesome community contributors
README update: em-http-request must be 1.0+
Update README.md
Wait longer in API spec to avoid false network failures
Improved exception handling

JSON body is only parsed on success.
If JSON body can't be parsed on a 200/201, a warning is emitted but call still
succeeds.
Keen IO exception messages have a standard prefix
More granular messages for async failures.
Exceptions from client deferrables not caught in Keen IO code
Improved test coverage of exception cases
Bump version 0.6.1
remove api key from gem, replace with write and read keys
Touchups from read/write key adding, extra README info

Bump version to 0.7.0. Not backwards compatible!
Update Gemfile.lock
0.7.1 - Support KEEN_API_URL configuration
Fix support for non-https custom api hosts
Bump for non-https fix
Require net http earlier