Added time filter to query search page (#1329)

* Added time filter to query search page

* Added start date

* Updated python endpoint test

* changed spec

* Added specs and tests

* Modified python/js tests and some function/file names
based on code review comments

* Resolved conflicts in DashboardSelect_spec and QuerySearch_spec

* Break python tests for separate functions, Move sql queries to setUp()

* Get around eslint error for spec

* Small changes based on comments

caravel/assets/javascripts/SqlLab/constants.js

@@ -0,0 +1,24 @@
+export const STATE_BSSTYLE_MAP = {
+  failed: 'danger',
+  pending: 'info',
+  fetching: 'info',
+  running: 'warning',
+  stopped: 'danger',
+  success: 'success',
+};
+
+export const STATUS_OPTIONS = [
+  'success',
+  'failed',
+  'running',
+];
+
+export const TIME_OPTIONS = [
+  'now',
+  '1 hour ago',
+  '1 day ago',
+  '7 days ago',
+  '28 days ago',
+  '90 days ago',
+  '1 year ago',
+];