Merge pull request #23 from kananoja/master

[nemo-qml-plugin-email] Register EmailFolder as a qml type
[nemo-qml-plugin] Add signature role to accountsListModel.

Remove unrelated function getMessageBodyFromFile().
Merge pull request #24 from VDVsx/master

[nemo-qml-plugin] Add signature role to accountsListModel.
[nemo-qml-plugin-email] Remove FolderListModel inbox realted functions

Rename totalNumberOfFolders -> numberOfFolders.
Merge pull request #25 from VDVsx/master

Remove FolderListModel inbox related functions
[nemo-qml-plugin] Add sortBy property and role to EmailMessageListModel