Added case/switch as keywords

Merge pull request #69 from skx/regexp-literal-capture

Regexp literal capture

Merge pull request #59 from skx/58-lexer-names

Be less strict about identifier names.

Merge pull request #56 from skx/55-ternary

55 ternary

Build the release before uploading for a release

Lower precedence of || + &&.

This will resolve problems with the following program:

        if ( name == "Steve" && age == 32 ) {  puts( "OK\n"); }

Upload the correct binaries on release

Removed .string() and type() from each object.

Rather than having to define string() and type() for each object
we make any function with an "object." prefix available to all
types.

So you could define:

        function string.foo() { };

Which declares the method "foo" is available to string-objects,
or declare:

        function object.foo() { };

To make it available to any type.

Documented, briefly the method-based functions

Fix scoping for constants.

Constants are always read-only in the parent-scope, but not in the
current one.  This allows functions to shadow-constant variables.

This closes #21.