Allow lax imports

Lax imports widen the range of valid imports in Golo, as in:

    import java.util
    function foo = -> Arrays.asList(1, 2, 3)

or,

    import java
    function foo = -> util.Arrays.asList(1, 2, 3)

Previously, one would have had to use either of the following constructs:

    import java.util.Arrays
    function foo = -> Arrays.asList(1, 2, 3)

or,

    import java.util.Arrays
    function foo = -> asList(1, 2, 3)
Include java.lang in the default imports
Merge pull request #122 from jponge/wip/lax-imports

Allow lax imports