add configuration options for storageType for REST API

[swaheed2]

accept optional body for do_PUT_Database with storageType as key.

Example:

var data = {
    storageType : "ForestDB"
    //ForestDB
    //SQLite
};

[hideki]

Hi @swaheed2,
API change is for cross-platform item. We need to talk with other platform engineers. Please wait for a while.

[swaheed2]

No problem.

FYI. I tested it on Android using these steps and it works: (couchbaselabs/Couchbase-Lite-PhoneGap-Plugin#79)

[hideki]

Additional comment from team member:

• Do we need to support encryption?

[hideki]

Hi @swaheed2
We are internally working for this item. API could be different from you proposed. We will track this item here. So I will closed this PR.
Thank you for your contributions!