Cleanup, remove providers from core tree
Change project metadata to augeasproviders_core
Fix use of seq entries with Puppet 3.4 optimisation (GH issue #101)

  * Add a new next_seq method
Retry Travis build steps
Load shared contexts and shared examples
Filter warnings about directory environments in fixtures.rb
Add augeasproviders_shellvar to .fixtures.yml
Add ssh
Add apache
Add sysctl and syslog
Add grub
Add nagios
Add postgresql
Add pam
Add Coveralls support
Use Coveralls formatter for SimpleCov
Improve SimpleCov filters
Add badges to README.md
Disable coveralls for Ruby 1.8 builds
Do not require coveralls on Ruby 1.8