Optimizations that can be done in 1.4.9
Merge pull request #3 from btchip/integration-1.4.9

Optimizations that can be done in 1.4.9
BTChip 1.4.9 optimisation enabled
0.0.41 release

 - Simple subaccounts implementation
 - Connection handling fixes/improvements
 - BTChip 1.4.9 firmware support
 - Enabled the Thai language
Fixed subaccounts with BIP70 payment requests
0.0.43 release

 - Added option to skip Electrum instead of showing 'cannot read property 0 of
   'undefined' caused by Electrum not returning transactions
 - Added timeouts for Electrum servers to prevent the app from hanging on sending
   transactions
0.0.44 release

 - Updated Electrum servers list
 - Simplified the 'Receive Money' tab
 - Connection timeouts added to avoid the app hanging
 - Other minor UX improvements
0.0.45 release

 - BTChip set up using BTChip's seed
 - 'previously generated addresses' pagination
 - Subaccounts renaming functionality
 - More pricing sources
 - Other minor UI improvements
0.0.46 release

 - BTChip fixes
0.0.47 release

 - Ability to set custom (per kB/constant) transaction fee
 - Improved BTC amounts formatting
 - Signup allowing to relink email address to a new account
 - Added BTCChina ticker
0.0.48 release

 - fixed broken numbers formatting
 - fixed get_balance called twice on login
0.0.49 release

 - Subaccounts in address book
 - Ability to edit or add memo in tx details
 - Fixed 2FA disabling in the same session as signup
 - Added Kraken ticker
0.0.50 release

 - BTChip firmware upgrade support
 - BTChip recovery seed login support
0.0.51 release: 2of3 subaccounts support