#6: Check in tcpdf
#6: First cut of PDF support
 - Remove support for pagewidth/pageheight parameters from plot routes. This is replaced by a 'pagesize' parameter, which can be any paper size defined in app/config.php and an 'orientation' parameter which can be L=Landscape or P=Portrait. Default is P=Portrait
 - Add a new MgPdfPlotter class which does the heavy lifting of PDF plotting. Most of the implementation is based on the existing PDF QuickPlot code from Fusion
 - Add PDF plot URLs to kitchensink example
 - Update swagger API docs, to reflect updated parameters
#60: Nuke vendor directory
#60: Add vendor to .gitignore
Update README.md