integration of vault info tests
VaultInfo BDD test has been integrated
Error handling done for Session creation if user name is null
vaultinfo.test.js Test cases updated such that every test can be executed independently
Changes in backend code reverted
VaultInfo and Session Info BDD tests has been updated
Merge pull request #10 from maidsafe/MAID-253-BDD_Test_VaultInfo

Maid 253 bdd test vault info