Add new feature --ignore-path option

solhint.js

@@ -15,6 +15,7 @@ function init() {
         .usage('[options] <file> [...other_files]')
         .option('-f, --formatter [name]', 'report formatter name (stylish, table, tap, unix)')
         .option('-q, --quiet', 'report errors only - default: false')
+        .option('--ignore-path [file_name]', 'file to use as your .solhintignore')
         .description('Linter for Solidity programming language')
         .action(execMainAction);
 
@@ -81,13 +82,25 @@ function writeSampleConfigFile() {
 }
 
 const readIgnore = _.memoize(function () {
+    let ignoreFile = '.solhintignore';
+
     try {
+
+        if(program.ignorePath) {
+            ignoreFile = program.ignorePath;
+        }
+
         return fs
-            .readFileSync('.solhintignore')
+            .readFileSync(ignoreFile)
             .toString()
             .split('\n')
             .map(i => i.trim());
-    } catch (e) {
+
+    } catch (e){
+
+        if (program.ignorePath && e.code == 'ENOENT') {
+            console.error(`\nERROR: ${ignoreFile} is not a valid path.`);
+        }
         return [];
     }
 });