installation/upgrade code in harness
add pe_install and pe_upgrade commands to the dsl
adding branan's answer file changes to the built in installer
adding 'fix negative grep command' from pe_acceptance_tests
https://github.com/puppetlabs/pe_acceptance_tests/commit/7599ff9e0a428effa8a9c5137e5d2f10f071abc8
adding 'wait for puppetdb to start on 3.0.0, PE-1105'
https://github.com/puppetlabs/pe_acceptance_tests/commit/c479972d4202f04d5c03baf8e0b2ef0b25e16dbf
Merge pull request #6 from anodelman/installer

installation/upgrade code in harness