Issue postmanlabs#155 - pure java codegen. Adding new code generator …

…using java 8.

codegens/java-native/.gitignore

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+.DS_Store
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Coverage directory used by tools like istanbul
+.coverage
+
+# node-waf configuration
+.lock-wscript
+
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Typescript v1 declaration files
+typings/
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+
+out/

codegens/java-native/.npmignore

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+### NPM Specific: Disregard recursive project files
+### ===============================================
+/.editorconfig
+/.gitmodules
+/test
+
+### Borrowed from .gitignore
+### ========================
+
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Prevent IDE stuff
+.idea
+.vscode
+*.sublime-*
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+.coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Typescript v1 declaration files
+typings/
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+
+snippet.swift
+
+out/

codegens/java-native/README.md

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+# codegen-java-okhttp
+
+> Converts Postman-SDK Request into code snippet for Java.
+
+#### Prerequisites
+To run Code-Gen, ensure that you have NodeJS >= v6. A copy of the NodeJS installable can be downloaded from https://nodejs.org/en/download/package-manager.
+
+## Using the Module
+The module will expose an object which will have property `convert` which is the function for converting the Postman-SDK request to java-okhttp code snippet and `getOptions` function which returns an array of supported options.
+
+### convert function
+Convert function will take three parameters
+* `request`- Postman-SDK Request object
+
+* `options`- options is an object which can have following properties
+    * `indentType`- string representing type of indentation for code snippet. eg: 'Space', 'Tab'
+    * `indentCount`- positiveInteger representing count of indentation required.
+    * `includeBoilerplate`- boolean representing whether to include class definition in code snippet 
+    * `requestTimeout` : Integer denoting time after which the request will bail out in milli-seconds
+    * `trimRequestBody` : Trim request body fields
+    * `followRedirect` : Boolean denoting whether to redirect a request
+
+* `callback`- callback function with first parameter as error and second parameter as string for code snippet
+
+##### Example:
+```js
+var request = new sdk.Request('www.google.com'),  //using postman sdk to create request  
+    options = {
+        indentType: 'Space',
+        indentCount: 2,
+        includeBoilerplate: false
+    };
+convert(request, options, function(error, snippet) {
+    if (error) {
+        //  handle error
+    }
+    //  handle snippet
+});
+```
+
+### getOptions function
+
+This function returns a list of options supported by this codegen.
+
+#### Example
+```js
+var options = getOptions();
+
+console.log(options);
+// output
+// [
+//       {
+//         name: 'Set indentation count',
+//         id: 'indentCount',
+//         type: 'positiveInteger',
+//         default: 2,
+//         description: 'Set the number of indentation characters to add per code level'
+//       },
+//       ...
+// ]
+```
+
+### Guideline for using generated snippet
+
+* Generated snippet uses `.setRequestMethod(nameOfMethod)` from `HttpURLConnection` class to form HTTP request. If the `method` doesn't require body then the value of `con.setDoOutput()` will be `false`. 
+
+* Generated snippet creates a BiConsumer for handling Form Data `BiConsumer<String, String> uploadFileFunction`  when `multipart/formdata` is used otherwise it uses `DataOutputStream` in order to add body to request.
+
+* Since Postman-SDK Request object doesn't provide complete path of the file, it needs to be manually inserted in case of uploading a file.
+
+* `content-type` needs to be specified in order to add body to the request. So if no `content-type` is specified then `text/plain` will be used as default. **In case of `multipart/formdata` `content-type` is generated by snippet itself**.
+
+* This module doesn't support cookies.

codegens/java-native/index.js

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+module.exports = require('./lib');

codegens/java-native/lib/index.js

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+module.exports = {
+  convert: require('./javanative').convert,
+  getOptions: require('./javanative').getOptions
+};
+