CB-5720 add resource-file to plugin.xml
CB-5720 add resource-file to plugin.xml for all platforms
reverted last change because ios does already support resource-file
CB-5720: emit warning if resource-file is not supported on platform
CB-5006 Fix searchpath not being passed to dependent plugins.
CB-5802 Updated version and RELEASENOTES.md for release 0.18.0
Bump node-xcode dependency version
Update node-xcode dependency to 0.6.6
CB-5299 Cache pbxproj to avoid re-parsing it for each plugin.

Parsing pbxproj is very slow (~250ms on my machine). It is done for each plugin
that needs to add frameworks to the ios project. This change is a quick and
dirty fix to allow caching the parsed pbxproj object so that it can be reused for
multiple plugins during prepare.

Timings on a test project for cordova prepare ios:
before: 1.623s
after:  0.981s
CB-5804: added repo & issues to plugman publish
CB-5891 Fix engine check when path has spaces.
updated release notes
Setting version to 0.19.0
Tweak release notes
CB-5962 Incremented plugin version to -dev branch.
src/platforms.js: Adding tizen.
README.md: Adding Tizen to list of supported platforms
Updated readme to reflect that Windows8 IS supported
wip implementing reading guid from 'framework' project
Adding spec for Tizen platform