adding performance benchmark sample test files
fixing text in readme
adding load test example to markdown readme
tweaking load test example in markdown readme
Tested for PHP 5.2 support, (phpunit test requires php 5.3+)
Added example-cli.php, replaced example.php with web based example
Added XLSXWriter::sanitize_filename()
Added support for leading 0s in strings, including unit test
Fixed issue, detecting invalid types
Now checking for valid UTF8.  Now using buffered write for improved write performance.
fixing date format
allow to write data row by row
use tabs instead of spaces like in the other lines
Merge pull request #12 from sebastiankalwa/write-by-line

Allow writing line by line using writeSheetHead, writeSheetRow and writeSheetFooter
fixing unit test to work with buffered writer
rename writeSheetRow to writeSheetCurrentRow, rewriting "per row" functions to not need to know rowcount up front, and not necessitate calling of writeSheetHead and writeSheetFooter from last nights pull request
modifying load test example in README.md
making deprecated writeSheetHead() backwards compatible with last nights commit
making sure finalizeSheet is called, even in 1 row at a time mode
fixing example in README to give correct output
fixing bug where 2 sheets were the same
adding support for windows server, adding ini_set settings to turn off display_errors in example