Wicked Good XPath 1.2

• Fixed a bug in binaryExpr.js where the comparison of two evaluation results might be wrong.
• Better support for wildcard namespaces and wildcard names.
• Support for period (.) inside node names.
• Added an optional opt_force parameter to wgxpath.install() to allow force installation of the library.
• We now build with Gulp.
• The built wgxpath.install.js file is now in ECMAScript 5's strict mode.