Ignore the "pre-release compiler" warning.

The parsing component should ignore the pre-release compiler warning.
The warning should be displayed to the user at some point, but the user
cannot fix the warning by changing the source code and thus the parser
should at least continue operating.

parser.js

@@ -9,6 +9,9 @@ if (solc_listener) {
   process.removeListener("uncaughtException", solc_listener);
 }
 
+// Warning issued by a pre-release compiler version, ignored by this component.
+var preReleaseCompilerWarning = "This is a pre-release compiler version, please do not use it in production.";
+
 module.exports = {
   parse: function(body, fileName) {
     // Here, we want a valid AST even if imports don't exist. The way to
@@ -40,8 +43,13 @@ module.exports = {
 
     output = JSON.parse(output);
 
-    if (output.errors) {
-      throw new CompileError(output.errors[0].formattedMessage);
+    // Filter out the "pre-release compiler" warning, if present.
+    var errors = output.errors ? output.errors.filter(function(solidity_error) {
+      return solidity_error.message.indexOf(preReleaseCompilerWarning) < 0;
+    }) : [];
+
+    if (errors.length > 0) {
+      throw new CompileError(errors[0].formattedMessage);
     }
 
     return {
@@ -96,10 +104,16 @@ module.exports = {
 
     output = JSON.parse(output);
 
-    var nonImportErrors = output.errors.filter(function(solidity_error) {
+    // Filter out the "pre-release compiler" warning, if present.
+    var errors = output.errors.filter(function(solidity_error) {
+      return solidity_error.message.indexOf(preReleaseCompilerWarning) < 0;
+    });
+
+    var nonImportErrors = errors.filter(function(solidity_error) {
       // If the import error key is not found, we must not have an import error.
       // This means we have a *different* parsing error which we should show to the user.
       // Note: solc can return multiple parsing errors at once.
+      // We ignore the "pre-release compiler" warning message.
       return solidity_error.formattedMessage.indexOf(importErrorKey) < 0;
     });
 
@@ -110,7 +124,7 @@ module.exports = {
 
     // Now, all errors must be import errors.
     // Filter out our forced import, then get the import paths of the rest.
-    var imports = output.errors.filter(function(solidity_error) {
+    var imports = errors.filter(function(solidity_error) {
       return solidity_error.message.indexOf(failingImportFileName) < 0;
     }).map(function(solidity_error) {
       var matches = solidity_error.formattedMessage.match(/import[^'"]+("|')([^'"]+)("|');/);