Add overload for AddJsLink that takes IEnumerable

Update old AddJsLink to use the new overload instead
Remove dependency on CSV strings
Refactored Add-SPOWebPart in two separate cmdlets
filename fix
Fixed GetWebParts() to support different pages
Refactored to use OfficeDevPnP.Core
Refactored DeleteWebPart to accept server relative urls
Updated changelog
Refactored to use OfficeDevPnP.Core
Moved methods into OfficeDevPnP.Core
fixed method comments
Merge pull request #63 from erwinvanhunen/Refactoring

Refactoring
Mark EventCategory as obsolete
Merge pull request #61 from pbjorklund/addjslink_ienumerable

Add overload for AddJsLink that takes IEnumerable
Add site extension method to install solution packages (WSP)
Change magic catalog numbers to use existing enum
Merge pull request #64 from sgryphon/MiscUpdates

Add site extension method to install solution packages (WSP)