add ability to list issues by tracker type
improve readme
Merge branch 'master' of https://github.com/evanlivingston/redmine-cli

Conflicts:
	README.markdown
	lib/redmine-cli/cli.rb
	lib/redmine-cli/generators/.redmine
Merged older README stuff.
Squashed some bugs created by merge.
- Adjusted bug in projects (count was wrong)
- Modified "show" to show more information.