Renamed "usee" to "uee".

The naturalize tool detected that using "uee" is more consistent with
the current codebase state:
* "uee" in LocalStore is 28.47% probable ("usee" 5.01%)
* "uee" in TextBody is 45.02% probable ("usee" 9.10%)
Renamed "s" to "sizeParam".

The naturalize tool detected that using "sizeParam" is more consistent
with the current codebase state:
* "sizeParam" in LocalStore is 22.89% probable ("s" 10.52%)
Renamed "local_folder" to "localFolder".

The naturalize tool detected that using "localFolder" is more consistent
with the current codebase state:
* "localFolder" in MessageListFragment is 76.31% probable ("local_folder" 23.69%)
Renamed "tokens" to "tokenizer".

The naturalize tool detected that using "tokenizer" is more consistent
with the current codebase state:
* "tokenizer" in MessageCompose is 60.40% probable ("tokens" 39.60%)
Renamed "identitiy" to "identity".

The naturalize tool detected that using "identity" is more consistent
with the current codebase state:
* "identity" in SettingsImporter is 78.46% probable ("identitiy" 21.54%)
Fix sendCommand line splitup for some imap proxys

When sending a command it would be sent like this:
PKG1: 1 STARTTLS
PKG2: \r\n

Some imap proxys (maybe from Fortinet?) don't accept commands across packets:
PKG1: 1 STARTTLS\r\n
Remove old IntelliJ project files

Recent IntelliJ versions support building with Gradle
Don't combine strings in code
Put long-running operation into AsyncTask
Merge pull request #454 from mallamanis/master

Renaming variables for codebase consistency
Merge pull request #456 from asdil12/single_pkg_command

Fix sendCommand line splitup
Use Locale.US where appropriate

Applicable for strings not intended for user consumption.

A %d string format code can generate eastern-arabic numerals
for users with an arabic locale.

V/k9      (20763): conn1103774136>>> 5 UID SEARCH ٦٤٦:٦٧٠ NOT DELETED
V/k9      (20763): conn1103774136<<<#5# [BAD, Invalid Search criteria]
E/k9      (20763): synchronizeMailbox
E/k9      (20763): com.fsck.k9.mail.store.ImapStore$ImapException: Command: UID SEARCH ٦٤٦:٦٧٠ NOT DELETED; response: #5# [BAD, Invalid Search criteria]
Delete old journals when moving the database