update some comments
remove hostname '192.168.1.2' for testing section
tname '192.168.1.2' for testing section
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remove hostname 192.168.1.2 for testing section
Add filter() and map() methods
Update README.md

add filter() and map() for collection.
update test
Merge branch 'master' of git://github.com/purekid/mongodm
Update README.md