V2.4.1: Fix selector attributes + fix equalHeight + fix hidden helpers

v2.4.0

[DOC] Complete documentation with _key-order (ie. _md-first) - fix ex…

…ample

Version 2.3.6

Version 2.3.5

Version 2.3.4

Version 2.3.3

[VERSION] Create 2.3.2 version

Change version to 2.3.1 to fix npm error version

Compile with class selector in v2.3.0