Remove files not necessary for Gradle builds
Move main application from root project to subproject 'k9mail'
Use default directory structure for tests-on-jvm subproject
Update Transifex client configuration
Move lint configuration file into 'config' folder
Remove outdated docs
Make ckChangeLog an external dependency
Move TracingPowerManager into mail package
Move 'mail' package to library project
Run checkstyle and findbugs on k9mail-library
Merge branch 'gradle_only_and_k9mail_library'

Conflicts:
	k9mail-library/src/main/java/com/fsck/k9/mail/transport/imap/ImapSettings.java
	src/com/fsck/k9/mail/store/imap/ImapSettings.java
	src/com/fsck/k9/mail/transport/imap/ImapSettings.java