ENYO-1740, ENYO-1890, ENYO-1888: implement Hermes verbs on top of dropbox-fs

Next (and last) step is to make this work behind a corporate proxy.

* ENYO-1740, ENYO-1888: fsDropbox behind corporate proxy (5/5) (HEAD, enyojs/ENYO-1740, ENYO-1740)
* ENYO-1740: add generic dynamic services configuration
* ENYO-1740, ENYO-1888: fsDropbox behind corporate proxy (4/5)
* ENYO-1740, ENYO-1888: fsDropbox behind corporate proxy (3/5)
* ENYO-1740, ENYO-1888: fsDropbox behind corporate proxy (2/5)
* ENYO-1740, ENYO-1888: fsDropbox behind corporate proxy (1/4)
* ENYO-1740, ENYO-1907: fix project creation on Opera
* Merge remote-tracking branch 'enyojs/master' into ENYO-1740 (HEAD, enyojs/ENYO-1740, ENYO-1740)
* ENYO-1740, ENYO-1890: Dropbox, enhance & document GET
* ENYO-1740, ENYO-1890: Dropbox, fix PUT of existing file
* ENYO-1740, ENYO-1890: Dropbox, implement MOVE & COPY
* ENYO-1740: Dropbox, implement DELETE
* ENYO-1740: Dropbox, implement GET
* ENYO-1740: Dropbox, implement PUT (2)
* ENYO-1740: Dropbox, implement PUT
* ENYO-1740: temporary checkin of modified (fixed) dropbox-js
* ENYO-1740: use modified node-XMLHttpRequest from enyojs
* ENYO-1740: remove xmlhttprequest module from dropbox


Enyo-DCO-1.1-Signed-off-by: Francois-Xavier KOWALSKI <francois-xavier.kowalski@hp.com>