Merge pull request #1 from bdelacretaz/master

.gitignore added, and README tweaks
Merge pull request #2 from bdelacretaz/master

As mentioned by Igor, it's not only the dom bundle that's problematic
Merge pull request #3 from bdelacretaz/master

sling-mail-archive-server-specs.md added
Add services: Mime4jMessageStore, MboxParser; refactor ImportMboxServlet.
Java files of previous commit.
ThreadKeyGenerator
Finishing touches to refactoring.
+ Mime4jMboxParserImpl.java
ThreadKeyGeneratorImplTest added
ThreadKeyGeneratorImpl refactoring + tests
Server-side JUnit test for MessageStoreImpl
MessageStoreImpl tests
Mime4jMboxParserImpl tests
Streaming implementation of MboxParser
Nice failing for Mime4jMboxParserImplStreamingTest
jacoco test coverage setup added, report goes to target/site/jacoco/index.html
Refactoring: issues #14, #15
Refactoring: issues #4, #12
Issue #20: MAS launchpad
Issue #21: consolidate all bundles