chakrashim: Fix Error.captureStackTrace

Error.captureStackTrace did not convert the type of line and column
numbers to numbers while creating the v8 capture objects. This breaks
modules which assumes number types. Changed to call parseInt if line
and column numbers are defined

PR-URL: #483
Reviewed-By: Kyle Farnung <kfarnung@microsoft.com>
Reviewed-By: Jimmy Thomson <jithomso@microsoft.com>

Author: digitalinfinity

deps/chakrashim/lib/chakra_shim.js

@@ -157,8 +157,8 @@
       const fileDetails = stackDetails[2].split(fileDetailsSplitter);
 
       const fileName = fileDetails[0];
-      const lineNumber = fileDetails[1] ? fileDetails[1] : 0;
-      const columnNumber = fileDetails[3] ? fileDetails[3] : 0;
+      const lineNumber = fileDetails[1] ? parseInt(fileDetails[1]) : 0;
+      const columnNumber = fileDetails[3] ? parseInt(fileDetails[3]) : 0;
 
       errstack.push(new StackFrame(func, funcName, fileName, lineNumber,
                                    columnNumber));