IDE-993

Modified the com.liferay.ide.maven-feature/feature.xml to point to another
branding plugin called com.liferay.ide.maven.branding, created and added two images into
that branding plugin. They are called m2e-liferay.png and m2e-liferay32.png, and
also added an about.ini for indicate those images. Modified the pom file
for building the bundle.