Add option to specify a custom location for report generation

[kattrali]

Changes

• renamed constructor in bin/xcpretty to printer_opts
• added report_options to bin/xcpretty to handle custom report path argument
• use path option in JUnit reporter if specified, otherwise defaults to original location at build/reports/junit.xml
• move bin/xcpretty helper methods into XCPretty::Runner class

Note

This is a breaking change to reporter functionality. If anyone has a custom reporter, the constructor now takes an options hash.

Fixes #42

[supermarin]

As far as I can tell, right now this is supporting many reporters but one file path.
amirite?

If yes, we should definitely support path per output.
Either -r junit -o junit.xml -r html -o tests.html or -r junit=junit.xml -r html=tests.html would work

[kattrali]

I think we're set here now. The major change is that the arguments are slightly stateful-- --output can't be specified before --report, since the report options are assigned in order.