Merge PR #30: Quotation support and improvements

- Add quoted key support: $.store.book[0].price
- Fix error handling
- Use standard library instead of external dependencies

Note: Removed gopkg.in/src-d/go-errors.v1 dependency

fix: t.Fatal format and $..* tokenization

- Fix t.Fatal to t.Fatalf for proper formatting
- Fix $..* tokenization to not produce redundant * token

release: v0.1.0

- Add go.mod for modules support
- Fix t.Fatal to t.Fatalf in tests

Merge branch 'master' of github.com:oliveagle/jsonpath