Set renderingWebView baseURL to the app Bundle Path 

I made this slight change so that I can now easily use local images in my PDF Template by simply using

<img src="mylocalImageFile.png">
Merge pull request #11 from aaronwardle/master

Set renderingWebView baseURL to the app Bundle Path
Fix warnings for 64bit upgrade
Update mustache to v6.9.0. Close #20.
Merge branch 'mustache-64bit'
Merge branch 'master' of https://github.com/as-cii/PdfReportKit