Simplified int() and uint():
* no need to convert to Number, happens anyway
* for int(), use ">>" instead of "|" to be closer to ">>>" (uint())
* define constants as numbers, not computations
Simplified (x is int) and (x is uint) check a bit:
* ensure number (convert Number objects) by adding zero (x + 0)
* for int, use ">>" instead of "|" to be closer to ">>>" (uint)
implements #JOO-59
jangaroo-maven-plugin should support dynamic generation of manifest file
http://jangaroo.myjetbrains.com/youtrack/issue/JOO-59

Duplicated the <archive> configuration options of maven-jar-plugin.
Kept old <manifest> configuration as @deprecated.