Add support for maven/gradle versions

- Essentially use same concepts as jdk install to switch
  maven and gradle versions if those are defined with config.
- Bump to tool-cache 1.3.0 as 1.0.0 tries to use
  node_modules/@actions/tool-cache/scripts/externals/unzip which doesn't have
  execute flag so you'd get `Permission denied`
- `extractZipNix` in toolkit no longer support relative path so needs to
  resolve absolute path before passing file to these methods.
- Commit has my local build for `index.js` which probably should get
  recreated but makes it easier to test this from a PR branch.
- Fixes #40

package.json

@@ -24,10 +24,10 @@
   "author": "GitHub",
   "license": "MIT",
   "dependencies": {
-    "@actions/core": "^1.0.0",
+    "@actions/core": "^1.2.1",
     "@actions/exec": "^1.0.0",
-    "@actions/io": "^1.0.0",
-    "@actions/tool-cache": "^1.0.0",
+    "@actions/io": "^1.0.2",
+    "@actions/tool-cache": "^1.3.0",
     "semver": "^6.1.1",
     "typed-rest-client": "1.5.0"
   },