Prevent sending the X-Frame-Options header.
Revert "Added an experimental url to re-initialize server session (not secure"

This reverts commit 40fa82ab72659433761a092f5d8bd3d42bd4deab.
Merge branch 'master' into develop
Added an experimental url to re-initialize server session (not secure
yet).
deploy: Change Git repository url.
config.ru: Specify inclusion path.
zone.js: Partially jslinted. A probable bug remains.
view_session: jslinted code. Scope objects not exposed yet.
Merge branch 'master' into develop
static/js.. jslinted console.js.
static/js.. jslinted colorpicker.
static/js : jslinted draw_session.
static/js.. zone: fix inverted condition.
static/js.. viewer: jslinted code.
Moved external files to a subdirectory.
Partial jslinting of editor.js
static: jslint-ize editor.js
static: fix zone.js (jslint).
static: fix warnings in view_session (jslint).
static: fix warning in editor.js (jslint).