Bug 864098 - Add "Disable Cache" to options panel r=jwalker

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rename : browser/devtools/framework/test/browser_toolbox_options_disablejs.html => browser/devtools/framework/test/browser_toolbox_options_disable_js.html
rename : browser/devtools/framework/test/browser_toolbox_options_disablejs.js => browser/devtools/framework/test/browser_toolbox_options_disable_js.js
rename : browser/devtools/framework/test/browser_toolbox_options_disablejs_iframe.html => browser/devtools/framework/test/browser_toolbox_options_disable_js_iframe.html