Release of 1.5.5

- 68ecc5a03ae09470fc95426263789897c5601748: Merge pull request #1323 from mattrjacobs/remove-reactivesocket-modules
- e102e5db43018533aacdf7417b570097a6fb161b: Remove all ReactiveSocket modules - this should allow a build by JDK6/7
- 90b032073dd01b0a3646b250d68e92208d7a110e: Add v1.5.4 to CHANGELOG.md
