placeholder mixin should use a global sass variable

[badpenguin]

Ionic version:
[ ] 1.x
[X] 2.x

I'm submitting a ...
[ ] bug report
[X] feature request
[ ] support request

Current behavior:
in input.scss:

.text-input {
  @include placeholder();

Expected behavior:

.text-input {
  @include placeholder($placeholder-text-color);

OR change the mixin declaration from:

@mixin placeholder($color: #999, $text-indent: 0) {

to:

@mixin placeholder($color: $placeholder-text-color, $text-indent: 0) {

[badpenguin]

can i say: "AWESOME GUYS" ? :)

[ionitron-bot]

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