Changed require configuration to path relative to current working directory

For example working directory is `/home/foo/project_with_gemini/gemini/`.
We use js or json default path configuration or use `-c` option.
Run `./gemini` or `./gemini -c .very_special_configuration.json`.
And we get configuration relative to current working directory:
/home/foo/project_with_gemini/gemini/.gemini.conf.json
/home/foo/project_with_gemini/gemini/.gemini.conf.js
/home/foo/project_with_gemini/gemini/.very_special_configuration.json
not in directory anywhere in the node_modules.
Fixed #418.

Author: Alexandr Ishchenko

lib/config/index.js

@@ -81,7 +81,11 @@ function getDefaultConfig() {
 
 function requireModule(file) {
     try {
-        return require(file);
+        if (file.indexOf('./') === 0 || file.indexOf('/') !== 0) {
+            return require(process.cwd() + '/' + file);
+        } else {
+            return require(file);
+        }
     } catch (e) {
         if (e.code === 'MODULE_NOT_FOUND') {
             throw new GeminiError('Config file does not exist: ' + file);

test/functional/config.test.js

@@ -51,6 +51,16 @@ describe('config', function() {
                     return new Config(configPath('notExists.js'));
                 }, GeminiError);
             });
+
+            it('should read relative to current working directory', function() {
+                assert.deepPropertyVal(
+                  new Config(configPath('validConfig.js').replace(process.cwd() + '/', '')),
+                  'system.projectRoot', '/it/works');
+
+                assert.deepPropertyVal(
+                  new Config(configPath('validConfig.js').replace(process.cwd() + '/', './')),
+                  'system.projectRoot', '/it/works');
+            });
         });
 
         describe('.json', function() {
@@ -64,6 +74,16 @@ describe('config', function() {
                     return new Config(configPath('notExists.json'));
                 }, GeminiError);
             });
+
+            it('should read relative to current working directory', function() {
+                assert.deepPropertyVal(
+                  new Config(configPath('validConfig.json').replace(process.cwd() + '/', '')),
+                  'system.projectRoot', '/it/works');
+
+                assert.deepPropertyVal(
+                  new Config(configPath('validConfig.json').replace(process.cwd() + '/', './')),
+                  'system.projectRoot', '/it/works');
+            });
         });
     });
 });