Style guide changes part 1
Style guide changes part 2
Merge branch 'master' into ruby-style-guide

Conflicts:
	README.md
	features/support/browser_exclusion.rb
Merge branch 'master' into ruby-style-guide

Conflicts:
	lib/configuration_provider.rb
Remove class variables
Replace % with format
Clarify which profile is used for RubyMine execution
Get rid of non-nil checks for non-boolean values
Rename boolean methods to contain following question mark
Capitalize comments
Explicitly mark private class methods
Change Browser to module
Redesign reading log level from config file, to get rid of instance variables in ConfigurationProvider
Revert "Redesign reading log level from config file, to get rid of instance variables in ConfigurationProvider"

This reverts commit b2190c06983d3f2285be4088c3b87a58046672e0.
Make modules holding state classes
Run all features by default when started in IDE
Add missing parentheses and harmonize assignment operators
Use implicit begin blocks
Cleanup code after recent refactoring
Switch from string concatenation to formatting