Merge branch 'master' of https://github.com/mk-j/PHP_XLSXWriter

Merge pull request #257 from LDAV/patch-1

Fix php 7.4 error

Merge pull request #179 from mk-j/2017-12-0.37-r1

2017 12 0.37 r1

Merge pull request #160 from mk-j/2017-09-0.36-r1

2017 09 0.36 merge fixes broken example

Merge pull request #140 from mk-j/2017-07-0.35-rc1

2017 07 0.35 rc1

removing additional composer file dependencies

auto-detect unknown column types (ie missing header def for last column)

Merge pull request #84 from mk-j/2017-styles

add 2017 styles, remove shared string index

Merge pull request #37 from mk-j/dev

Merge Cells from dev branch

Merge pull request #18 from munisense/improvement/ComposerPHPUnit

Switched from a global phpunit install to using composer to manage the phpUnit dependency and autoloading.