Update minimum PHP version requirement to 5.5

.travis.yml

@@ -1,7 +1,6 @@
 language: php
 
 php:
-  - 5.4
   - 5.5
   - 5.6
   - 7.0
@@ -24,7 +23,7 @@ matrix:
   fast_finish: true
 
   include:
-    - php: 5.4
+    - php: 5.5
       env: COVERALLS=1 DEFAULT=0
 
     - php: 7.0

composer.json

@@ -18,11 +18,10 @@
         "source": "https://github.com/cakephp/cakephp"
     },
     "require": {
-        "php": ">=5.4.16",
+        "php": ">=5.5.0",
         "ext-intl": "*",
         "ext-mbstring": "*",
         "nesbot/Carbon": "1.13.*",
-        "ircmaxell/password-compat": "1.0.*",
         "aura/intl": "1.1.*",
         "psr/log": "1.0"
     },