[dev] changed ShaRe: :getShareCriteria() logic

[Duck]

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Changes the owner attribute of getShareCriteria, listShares and countShares 
methods to allow passing an array of attributes values/keys. Passing a string 
will make it run as before (assuming is an share owner username). Otherwise 
will pass trough array key/values and restrict  the selection of shares to 
attributes corresponding shares.

For example, as in the attached Ansel testing script, we can direct 
select/count galleries in a particular category. Of course I will implement 
browsing galleries grouped by categories if this will be committed.

Duck

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