Small PHP adjustments in Chisel methods#415

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JakubSzajna wants to merge 2 commits intoxfiveco:masterfrom

JakubSzajna:adjustments

Commits on Jan 28, 2019

Allow modifiers in `className` to accept array instead of list of args
Jakub Szajna
committed

Commits on Jan 29, 2019

Allow Post::get_field method to accept default value returned when field is empty.
Jakub Szajna
committed