Deprecating warning messages when using lists

[patrijuh]

When using lists, there comes not expected deprecated warning messages.

Example:

@{list}= Create List Username Password
Wait Until Page Contains ${list[1]}

In latter kw there comes an warning:

'=' is deprecated as locator strategy separator. ':' should be used instead

[Hi-Fi]

Fixed already with #68. Releasing fix now.

[Hi-Fi]

Currently release if blocked because of Travis's issue with access to Maven central.