Merge pull request #2 from brodkinca/develop

Add helpful icons to README.md
Merge branch 'develop'
Merge branch 'develop'
Merge branch 'develop'
Display code coverage data in terminal.
Fix #4 Underscores should not prefix private methods.
Underscores should not prefix private properties.
Related to #4
Remove print_r from Response::debug, replace with a foreach loop.
Fix spelling error.
Whitespace fixes.
Fix return type for CURL::execute.
Remove unnecessary destructor.
Fix array to string conversion error for certain types of curl_getinfo output.
Remove last vestiges of HTML from Ressponse::debug output.
Display output type in Response::debug.
Improve code coverage by supplying more complex data for Response::debug to display.
Fix spelling error in README.
Refactor test for CURL::option to be more reliable on fast computers and connections.
Add support for offline testing using PHP's built-in server.
Reduce line length in README for increased readability.