Travis CI silly bower related unhandled exception problem

[behram]

Describe issue

---

Bower throws unhandled exception on Travis CI build sometimes. We can fix this issue or remove bower dependency via bowerphp. Via bowerphp we can remove nodejs depen. too.

Related Links

---

• https://travis-ci.org/ojs/ojs/builds/190587365
• https://github.com/Bee-Lab/bowerphp
• https://www.sitepoint.com/bower-vs-bowerphp/
• https://symfony.com/doc/current/frontend/bower.html

Q	A
Branch/Tag?	"master"
Bug?	yes
New feature?	no