Added local package build feature:
    scoop can now be invoked inside a package directory with the package commands build,test,install,clean
    In local package mode no package is specified in the scoop command scoop considers cwd is package directory (e.g scoop build)

    Added skippable tests. By placing a file that starts with a capital S<test file> with out the .flx extension exists in the test dir
    the accompanying test will be skipped. (eg 01-test.flx S01-test)

    Added fail_not_fatal arg to run_cmd and run_test to support proceding with other actions if invocation of command or test fails

    Fixed odd comment