Merge pull request #270 from VesaJuvonen/dev

Updated readme file
Merge pull request #271 from VesaJuvonen/dev

Updated documentation
Merge pull request #272 from VesaJuvonen/dev

Added some notes on the nuget package and link to introduction
Update readme.md
Update readme.md
Fixed minor bug when setting title and created unit test to cover that glitch.
Merge remote-tracking branch 'contributor/initial' into pr275
Added SetSiteLockState to TenantExtensions
update to IsFeatureActiveInternal to deal with repetative feature activation/deactivation
Update to deal with 'clean' site:  checks are not executed when IPR feature is not active
Merge branch 'dev' of https://github.com/officedev/pnp into dev