Pointing cursor to the end every-time onFocus is called.

[kishankhakhar]

#122 Solved the open issue.
Everytime the onFocus function is called, the cursor would point to the end in-order to avoid editing of the current countryflag and code if the user starts typing immediately.

[kishankhakhar]

For instance, supposedly if a user is typing a phone number in a login form and in between he goes to a previous field and then comes back to the number field, the complete number typed by him previously gets selected and if he starts typing, the previous value gets overwritten.
To avoid this small issue, i have moved the cursor to the end of the current value everytime the onFocus method is called.