7th alpha release for v1.0

Changelog
---------
server: add _is_null operator, closes hasura#106 (hasura#129)
cli: inserts into schema_migration only once per version (fix hasura#127) (hasura#128)
cli: move metadata.yml file inside migrations folder, fix hasura#122 (hasura#125)
console: improve tests for relationships (close hasura#130) (hasura#131)
console: show indicative comments on graphiql if no tables are present (hasura#120)
console: fix and/or expressions in permissions builder (hasura#119)
console: fix secure endpoint link, update contributing guide (hasura#117)

v1.0.0-alpha06

Changelog

- go vet cli code (hasura#110)
- update readme and code of conduct (hasura#108)
- testing console tests in the ci (hasura#83)
- fix schema dropdown ui, redirect with urlPrefix, fix hasura#97 (hasura#107)
- add contributing guidelines for server (hasura#104)
- fix hasura#96, when access-key is set, cli should use it to contact api (hasura#100)
- close hasura#44, replace goyaml with ghodss/yaml (hasura#101)
- close hasura#102, unexport ParsedEndpoint in config (hasura#103)

v1.0.0-alpha05

00e4da5 update deploy workflow
6160e24 rename 'raven' to 'graphql-engine' in help text, closes hasura#87
4270529 basic test suite (hasura#78)
610c866 Adds license information in README (hasura#84)
6826cec console: add gzip compression to deployments (hasura#94)
57f9bfc close hasura#92 add waits for cli and server test (hasura#93)
4a76c7e server: throw 401 exception for accesskey mismatch/notfound, fix hasura#67 (hasura#71)
1f7f8e5 update test command in console makefile (hasura#69)
113b6a9 close hasura#57 fix messaging, expand track all relations (hasura#88)
83ab85f update readme and contributing guides (hasura#90)
29654fa remove license file reference
467988c Changes license
183cbb1 only deploy dev|release branches (hasura#76)
50165fc circleci integration (hasura#74)
b0e3cbd console: handle access key error code (hasura#66)
5a51248 console: add access key login, update messaging/tooltips (hasura#65)
a70f187 Add A-GPL license

v1.0.0-alpha04

- server: catch and log http exceptions from auth webhook, closes hasura#28
- server: use row expressions instead of json_build_object
- cli: handle server endpoints that contains a url path (hasura#64)
- console: update tests

initial alpha release of graphql-engine