Merge pull request #15 from kananoja/master

[nemo-qml-plugin-email] Add some folder id APIs.
[nemo-qml-plugin-email] Extend emailmessage object to support loading messages.

Extend emailmessage to support loading messages from store.
Change invokables to properties.
Merge pull request #14 from VDVsx/master

Extend emailmessage object to support loading messages.
[nemo-qml-plugin-email] Detect drafts folders properly.

Export drafts to remove server when remote folder is detected.
Merge pull request #16 from VDVsx/master

Detect draft folder properly.
[nemo-qml-plugin-email] Add messageIdToInt to EmailAgent