Merged in bump51 (pull request gazebosim#334)

bump to 5.1.0

Approved-by: Louise Poubel <[email protected]>
Approved-by: Addisu Z. Taddese <[email protected]>

Merged in round_up_multiple (pull request gazebosim#318)

Added roundUpMultiple function

Approved-by: Ian Chen <[email protected]>
Approved-by: Louise Poubel <[email protected]>

Merged in math_630 (pull request gazebosim#316)

Math 6.3.0

Approved-by: Louise Poubel <[email protected]>

Merged in bump62 (pull request gazebosim#313)

bump to 6.2.0

Approved-by: Louise Poubel <[email protected]>
Approved-by: Nate Koenig <[email protected]>

Merged in prepare_6.1 (pull request gazebosim#306)

prepare for ignition-math 6.1 release

Approved-by: Steven Peters <[email protected]>
Approved-by: Louise Poubel <[email protected]>

Remove pre from cmake

Added tag ignition-math5_5.0.0 for changeset 2c0df6e70907

5.0.0~pre4

Update to 6.0.0~pre4

Merged from default