changed protobuf wraper. now its using only maven-bundle-plugin since it is more clean.
improved jxls wrapper. now it is using only maven-bundle-plugin.
fixed symbolic-name.
Better OSGi building (cvgaviao's pull request): code style +don't change the jxls-reader version
Use correct springframework.expression version (thanks to afilipchik)
Better OSGi building (cvgaviao's pull request): remove the build.properties file in the pom-first osgi builds (not in the manifest-first osgi builds) because they serve no purpose