Change color of selected indicator

[intik]

For more visual clarity change color of selected indicator

[dshigh]

please add this feature

[pamobo0609]

It would be great if the colors of the borders and circles could be configurable also. Great lib btw.

[theangi]

I did something that allows a better customization right from the xml declaration, not specifically for the selected indicator but for all.

Right now, I've created the following attributes:

app:dots_fill_color="#ff0000"
app:dots_stroke_color="#000000"
app:dots_max_count="7"
app:dots_size="5dp"
app:dots_stroke_width="2dp"
app:dots_margin="2dp"

Not sure if ready to merge, I haven't tested edge cases and maybe further tuning is required: theangi@47b53bd