Update Readme.md

[pereferrera]

Adding beginner's guide to registering all needed jars in a Pig session.

[rangadi]

json-simple is required for LzoJsonLoader?

[rangadi]

Thanks for updating docs. will check with Pig folks about registering jars in the middle of a pig script... I think it is supposed to work ( but then, the order might matter).

[rangadi]

This is a good advice in any case.

[aniket486]

order of command does matter. Whatever you use on a line should have corresponding register before that line is parsed. Doing it at the beginning is ideal, but not a must have.

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