[enh] Login: add help text on file import

[enh] Login:
  - better UI on pubkey preview
  - remove "show salt" option
[enh] Crypto service: allow to change Scrypt params

[enh] Add connection fallback at startup - fix #476

- Ubuntu build: keep large screen code, allow camera enable or not, ...
- Blockchain (advanced) search: avoid row-header to be display twice during loading
- Index: add 'apple-touch-icon' head for icon in web build

- Login : add delay before pubkey computation

- Add features tour
- ES: Add Settings remote storage

- Login : Alert user if login into a empty account - Fix #167
- Login : auto compute pubkey (if device has grade 'a') - Fix #170

- Join wizard : more steps, with help button or hint text
- Unable to register on currency init (block#0 not written) fix #160

- New Settings service
- new csNetwork service, to manage network and peers access
- TX in protocole v0.3

- Update install documentation
- Fix android bug on String.startsWith() (was missing in old browser)
- Update cordova plugin (remove native transition)
- Add plateform Firefoxos and resources

- Login: add link for new account creation
- Add About modal
- Code refactoring : modal now as an default empty controller
- index.html : add a link for manifest.json #101
- ES : add CSS class on field error, in forms

- Code refactoring on login (split controller, store wallet on rootScope)
- BMA: add cache on get current UD
- ES : Market record view : display price on UD/Qty
- ES : Market record edit : add currency selection