1.3.0: Merge PullRequest and compatible to PHP 5.6

Merge pull request #63 from katzwebservices/master

Fix issue with PHP empty() function checking the status of the first line

1.2.0: Merge pull request #50 from cordoval/improvements

Improvements

• Update README.md. thx @gsmark
• Make LexerConfig optional. thx @Richtermeister
• Add PHP 5.6 to .travis.yml. thx @sasezaki
• Added support for writing column headers before an export. thx @maclof
• Enclosure can now be empty - '' or false. Useful when the provided values are already enclosed. thx @iplesca
• Various improvements. thx @cordoval

Bug fix

• Remove redundant check of valid callable. thx @Richtermeister
• Fix some comment grammer. thx @hanneskaeufler

1.1.0: Merge pull request #25 from gnutix/patch-1

Improvements

• Add mbstring requirement to composer. thx @gnutix
• .travis.yml - add PHP 5.5. thx @sasezaki
• Lexer and Config now supports the ability to skip a header row. thx @jared Fraser
• Added the ability for the callbackcollection to support AggregateIterator. thx @jared Fraser
• Added possibility to define fileMode in Standard Export. thx @danez

Bug fix

• Error when the last line is empty. thx @emmanuelgautier
• Fixed typo in readme.md. thx @bobey
• After all rows are written flush the contents to disk. thx @danez
• fixes #13 - setlocale() warning on CentOS. thx @meonkeys