Merge pull request #3 from kamoljan/master

BUG: Build error, the reason is the "math" lib missing on linux.
Update README.md

revert README.md
remove -DWEBP_EXPERIMENTAL_FEATURES
Avoid pass Go pointers from crossing the boundary into C in Go1.3.

See http://golang.org/doc/go1.3#garbage_collector
fix typo
avoid read all data in GetInfo
update README.md and fix build
update example
Update README.md
update example
update example
add LICENSE
optimize cgoIsUnsafePtr
fix test
avoid pass go address to C func
TEST: Moved all tests into test dir