Bunch of fixes + you can now call nmcpPublishAggregationToMavenLocal to verify your publishing process and/or test locally.

All changes:

• Add plugin marker for the settings plugin by @martinbonnin in #184
• Update to gratatouille 0.1.1 and use @GPlugin for the settings plugin by @martinbonnin in #185
• Use the snapshot version of the gratatouille plugin by @martinbonnin in #187
• Add nmcpPublishAggregationToMavenLocal by @martinbonnin in #192
• Always populate snapshotVersions manually by @martinbonnin in #193
• Bump bootstrapped version by @martinbonnin in #194