Add basic tests and CI

[tirkarthi]

• Adds tests for basic set, get and clear key.
• Adds Travis CI config and badge in README.

Since I don't have access to the project I can't add this to Travis CI. I tested the config in my fork. Feel free to edit this PR if you have plans to use other CI.

Travis build : https://travis-ci.org/tirkarthi/clj_fdb/builds/375447446

Thanks.

[vedang]

Thanks! I've cleaned up the tests and pushed them to master with this commit: https://github.com/vedang/clj_fdb/commit/c2e5695e08de6324b3ffb89e47c769fbf7782f43

The cleanup was as follows:

• The core functions don't need to be run inside a transaction, they'll do that themselves.
• The is clause was malformed, the value key was outside of the clause.
• I changed the names of the variables from key/value to k/v to avoid clobbering the built-in clojure.core/key fn.

[tirkarthi]

Thanks for the comments. I will keep them in mind with respect to my test suite too. I have some more tests that I will try porting as I find time.

https://github.com/tirkarthi/clj-foundationdb/blob/master/test/clj_foundationdb/core_test.clj

[vedang]

👍 That would be great!