Link RubotoCore platform apk version to JRuby version

[donv]

This is to make it easier to see what version of JRuby is in a RubotoCore apk. RubotoCore is, currently at least, just a repackaging of JRuby. I propose using the JRuby version and append a counter:

JRuby 1.7.0 => RubotoCore 1.7.0.0, 1.7.0.1, 1.7.0.1, ...
JRuby 1.7.1 => RubotoCore 1.7.1.0, 1.7.1.1, 1.7.1.1, ...
JRuby 1.8.0 => RubotoCore 1.8.0.0, 1.8.0.1, 1.8.0.1, ...

The scheme for the versionCode is the same where we multiply each part of the version name by 100

RubotoCore 1.7.0.0 => 1070000
RubotoCore 1.7.0.1 => 1070001
RubotoCore 1.7.1.0 => 1070100
RubotoCore 1.7.1.1 => 1070101

@ruboto @rscottm What do you think?

[donv]

Nobody cares about the RubotoCore version, I think. Rejecting.