README spelling fixes
Merge pull request #2 from geetarista/patch-1

README spelling fixes. Thanks!
Guard against non-deterministic values when doing analyze
Adding a changelog
Travis CI enable
Adding a simple PredicateSet
Adding a script to benchmark
Adding new AST nodes to implement optimizing predicate sets
Adding the base of the optimizing set
Branch checks if left/right branch is available
Add tests for PushResults and Branch ast nodes
Adding a simple pattern based tiler
Adding module and tests to start working on ast merge
Adding a new IterAll ast node
Change the IterAll as to Both
Rename to PushResult
More human usable name/descriptions
Bug fixes
Export optimized set
Improving bench tool