Update collections.clj

Added tests for nested calls to assoc.
Update collections.clj

Added rules for nested calls to assoc to recommend assoc-in, instead of the more generic update-in.
Merge pull request #97 from maacl/master

Suggested rules and tests to recommend use of assoc-in instead of nested calls to assoc.
Add double-negative rule

Fixes #41, code provided by @LiamGoodacre
Merge pull request #99 from danielcompton/fix-41

Add double-negative rule
Add Travis CI and README image
Add clojurescript, cljx, e.t.c. support

Fixes #67
Merge pull request #102 from danielcompton/add-clojurescript

Add clojurescript, cljx, e.t.c. support
Merge pull request #101 from danielcompton/add-travis

Add Travis CI and README image
Add JDK build matrix
Merge pull request #104 from jonase/add-build-matrix

Add Travis JDK build matrix
Update README with spelling and syntax
Merge pull request #95 from thomasmulvaney/missing-neg-case

Added missing negative case
Eval to make java based tests pass
Merge branch 'fix-java-tests' into fix-collection-rules