add basic save functionality

Author: OriHoch

.gitignore

@@ -1,7 +1,6 @@
 /vendor/
 /.idea/
 /coverage-clover.xml
-/composer.lock
 /.php_cs
 /.php_cs.cache
 /php-cs-fixer

README.md

@@ -15,9 +15,11 @@ A utility library for working with [Data Package](https://specs.frictionlessdata
 ### Installation
 
 ```bash
-$ composer require frictionlessdata/datapackage
+composer require frictionlessdata/datapackage
 ```
 
+Optionally, to create zip files you will need the PHP zip extension. On ubuntu it can be enabled with `sudo apt-get install php-zip`
+
 ### Package
 
 Load a data package conforming to the specs
@@ -98,6 +100,13 @@ $package->resource("resource-name", [
 $package->saveDescriptor("datapackage.json");
 ```
 
+Save the entire datapackage including any local data to a zip file
+
+```php
+$package->save("datapackage.zip");
+```
+
+
 ### Resource
 
 Resource objects can be accessed from a Package as described above

composer.json

@@ -5,7 +5,8 @@
     "require": {
         "php": ">=5.4",
         "justinrainbow/json-schema": "^5.2",
-        "frictionlessdata/tableschema": "^0.1.6"
+        "frictionlessdata/tableschema": "^0.1.6",
+        "alchemy/zippy": "=0.3.5"
     },
     "require-dev": {
         "phpunit/phpunit": "^4.8.35",