Added Digital Lego editor(s) icons.

Konstruktor (soon to come to a Linux distro near you ^_^)

![konstruktor](https://cloud.githubusercontent.com/assets/5674757/2988455/cffe025a-dc59-11e3-9768-95e47042793a.png)

LDLite

![ldlite](https://cloud.githubusercontent.com/assets/5674757/2988456/d002edec-dc59-11e3-8e97-925634a467c0.png)

LPub Instruction Editor

![lpub](https://cloud.githubusercontent.com/assets/5674757/2988457/d0035e9e-dc59-11e3-8d36-2517be914798.png)

input-tablet

![input-tablet](https://cloud.githubusercontent.com/assets/5674757/2988768/5416630e-dc5d-11e3-95fe-54bb746a0667.png)