Added support for index.vue files as component

[IKuijer]

Hey there, love the module you made. When I added it to my project I found a lot of components called 'index' because I use a file structure where I group related components together and use index.vue files as 'base' (sorta).

Example:

• /components/Header/index.vue (< Header />)
• /components/Header/Logo.vue (< Logo />)
• /components/Header/Menu.vue (< Menu />)
• etc.

I wrote a bit of code to use the folder name instead of 'index' for index.vue files.

Ps. this is my first fork/PR on a public repo so if could improve in some way please let me know :)

[acidjazz]

@IKuijer looks simple enough! thanks for the PR!