Don't add empty fields to JSON output.  Make escapeJSON() not modify the input string.
Don't add empty fields to JSON output.  Make escapeJSON() not modify the input string.
Fix conflict with master.
Fix botched conflict fix.
addressing multiple windows issues

  * #490 - use unique_ptr and roll our own swap
  * #491 - use C++11 random uniform distribution on the range of indices
Merge pull request #486 from PDAL/json

Don't add empty fields to JSON output.
Merge pull request #493 from chambbj/issues/490-win-constant-expression

addressing multiple windows issues