Add Scala 2.9.3 as a cross-compiler.

Change-Id: I210a601542d2952b54aa7284e7cea028d782f6e8
.gitreview: set defaultremote=origin for Git Extensions.

Without setting defaultremote to origin, Git Extensions issues this error
and the gerrit plugin fails:

  The remote "gerrit" specified with the "defaultremote" setting
  in the .gitreview file does not refer to a configured remote.
  Either create this remote or change the setting in the
  .gitreview file.

Change-Id: I063b2b026df4663f78ab392daf2ef4e782f0b541
Compile with Scala 2.10.1 instead of with 2.10.0.

Because Scala 2.10.1 is fully binary compatible with 2.10.0 [1],
no longer compile with 2.10.0.

[1] http://www.scala-lang.org/2.10.1

Change-Id: If1d089d88049f1565bd68c27ec20f2c292ea7470
Switch the default Scala compiler from 2.9.2 to 2.10.1.

Since 2.10.1 gives more compiler warnings and is the current stable
release, update to it.

Change-Id: I6452c647bb4d3ce41c6858c13d46bb975bc194f9
Update fom Scala 2.11.0-M1 to 2.11.0-M2 as a cross compiler.

Change-Id: Id94a6ec118e4e5c7c790fc4fac80dab4601c2123
log4j.properties: use %n instead of \n.

%n outputs the platform dependent line separator character or characters.

This conversion character offers practically the same performance as
using non-portable line separator strings such as "\n", or "\r\n".
Thus, it is the preferred way of specifying a line separator.

http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/PatternLayout.html

Change-Id: I800538606da8cf5ae7d981c665c80a66956eaee4
build.sbt: update to junit-interface 0.10-M4.

Change-Id: Id40cfda888f049ce1d940b7217dd6275c5c2f150
Update fom Scala 2.11.0-M2 to 2.11.0-M3 as a cross compiler.

Change-Id: I2e9d4ee862343675aedaf89b58e4c57763f6143d
Fix 'try without a catch or finally...' warning.

Caught by Scala 2.11.0-M3.

[warn] src/main/scala/com/imageworks/migration/Migrator.scala:290: A try without a catch or finally is equivalent to putting its body in a block; no exceptions are handled.
[warn]         try {
[warn]         ^

It appears that the original intention was to catch and handle a
NumberFormatException thrown by java.lang.Long.parseLong().

Change-Id: I9a04abe36aafe13ab238c895a4060265e15f6212