Minor Changes

1. Fixed fire shots burg(single) when merged, happened only when pressing Space key(32), not when clicking left click(right handed).
2. Added fire sound on player, when pressing Space key(32)
---index.html---
1. Erased the duplicate 'bootstrap.min.js' <script> tag.

---To do---
1. To Change the suri gabs between each others ; When merged, it's inevitable lol.
2. To fix merging burg ; even if the player is not captured by an enemy set as 'isSpider', if player shot the enemy, "merging" is occurred.