First version of a serializer of AccelerometerEvents into Protocol Buffers format.

Currently Findbugs fails the build because of the generated code.
Created Protocol Buffers serializer for AccelerometerEvents.
Renamed the Protocol Buffers serializer.
Removed generated code from source control, proto compilation is now handled by Gradle.

Note that IDEA had to be set up separately with the Protocol Buffers Plugin: http://plugins.jetbrains.com/plugin/4942
Add protocol buffers compiler to Travis config as install.
Ignore Findbugs and Checkstyle rule violations for now. See #27.
Added Chris Lea's protobuf-compiler package to be installed on Travis before building, so we have a 2.5.0 version.

See https://launchpad.net/~chris-lea/+archive/protobuf .
See verbose Travis output.
Trying to fix the error "protoc: error while loading shared libraries: libprotobuf.so.8: cannot open shared object file: No such file or directory"
Environment variables set on the same line for Travis. See http://docs.travis-ci.com/user/build-configuration/#Set-environment-variables .
Still doesn't work, trying sudo ldconfig: https://code.google.com/p/protobuf/issues/detail?id=213 .
Check what's getting loaded.
Trying again.
Find that file.
Try installing libprotobuf-dev as well.
Added PPA packages again.
Remove custom install and script.
apt-get should be quiet.
Excluding generated code works for Checkstyle, not yet for Findbugs.

See http://stackoverflow.com/questions/22037499/using-excludes-config-in-findbugs-and-checkstyle-plugin-in-gradle
Merge branch 'master' into serializer-protobuf