Add an equals method to Contact.
A contact is equals to an other if they got the same bare Jid.
16373c4cd73330fa568960a11a6ee7aea6886a4d sfr-release
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af35b5109f172411de5798991e89919b7ed5cf85 0.1.1
25f6fded204ab05c9f89556cbc08cd191e0f2c52 0.1.2
c77d496146964d9239b4c45446d99b960415a4a6 0.1.3