Fix length of error marker for missing src file

The length was not calculated properly. Length of attr.getValue() was
taken while it should be the length of attr.getValueRegionText(). The
difference comes when the attribute value is wrapped in quotes.
Merge pull request #27 from kaloyan-raev/error-length

Fix length of error marker for missing src file
Use IresourceProxyVisitor instead of using IResoureVisitor. See
https://github.com/angelozerr/eclipse-wtp-webresources/issues/20
Merge branch 'master' of https://github.com/angelozerr/eclipse-wtp-htmlcss.git
Remove wizard for file quick fix processor.
Enable/Disable search CSS id/class in the whole CSS files of the
project. See
https://github.com/angelozerr/eclipse-wtp-webresources/issues/20#issuecomment-63883658
Fix https://github.com/angelozerr/eclipse-wtp-webresources/issues/28
Add image, text for quick fix + create a valid empty file. See
https://github.com/angelozerr/eclipse-wtp-webresources/issues/23
Use image registry of plugin (to avoid having sometimes NPE).
[maven-release-plugin] rollback the release of eclipse-wtp-webresources-0.6.0
prepare 0.7.0 release
[maven-release-plugin] prepare release eclipse-wtp-webresources-0.7.0
[maven-release-plugin] prepare for next development iteration
prepare 0.8.0 dev branch