detect selector method by selector value
assign only selector values to the element prototcol function
added tests
updated readme and examples
minor formatting
improved test spec
added travis secures
updated protocol API - elementIdValue provides no GET method - was replaced by elementIdAttribute
added travis secures
added getElementCssProperty command for backwards compatibility
some wording fixes, added comments and backwards compatibility test
Merge pull request #122 from christian-bromann/selectorAPI

Implemented small selector API for better element querying
Merge pull request #118 from christian-bromann/issue/118

outdated use of GET element/:id/value
execute sauce test only on master branch
removed second sauce credentials
added travis browser matrix
added additional env vars
increased test timeouts in travis
removed mobile and unstable tests, minor test improvements
updated packages