Add maven-shade-plugin to graphhopper POM to append the contents of
differing service locator mapping descriptors under META/services into
one file per descriptor. 

NB. This change also migrates the android assembly exclusions from the
assembly-plugin.
Merge branch 'master' of https://github.com/engaric/graphhopper.git
Add shader TO POM to create uberjar and merge common service locator
resources in META-INF/services between dependencies into a one
dependency per descriptor.