Don't lock dependencies (#15)

Summary:
This isn't practical for projects with an internal source of truth.
Release branches will need testing.
Pull Request resolved: #15

Differential Revision: D14879782

fbshipit-source-id: 4154e4df890697645683055fe3ed7d66bad0b6d8

Author: fredemmott

.gitignore

@@ -3,3 +3,4 @@ tests/examples/*.out
 *.swp
 *.swo
 .DS_Store
+composer.lock