Fix font family of Fira Mono Medium

Fixes #114

Updated README with Go Mono entry

Spacemono

gUpdate README.rst

Add newly pushed font's info to list

Signed-off-by: Daehyeok Mun <daehyeok@gmail.com>

fix issue #196 Fira Mono (Fura Mono) has misaligned glyphs

Fix ligatures in Meslo, add dotted Meslo

Original taken from Google Web Fonts
http://www.google.com/fonts#UsePlace:use/Collection:Inconsolata

If no argument is given then `"$1"` is an empty string, so no need to bother.

Link to the correct fonts installation anchor

Update Hacks fonts to v2.020

Add 3270 font

Add quick install guide to readme

Add help and FontName parameter.

Text copied from https://www.google.com/get/noto/

Update install.sh to help OpenBSD users

Description taken from https://blog.golang.org/go-fonts.

Description was copied from the initial #206 PR comment by @kaniblu.

This fixes the following error received on OpenBSD when running `install.sh`.

```
$ sh install.sh
Copying fonts...
cp: cannot stat '%': No such file or directory
All Powerline fonts installed to /home/foo/.local/share/fonts
```

What's happening is that OpenBSD's `xargs` fails without the `-n1` option (i.e. copy the files one-at-a-time).

Adding the `-n1` seems to be compatible with Linux (I tried it on a CentOS system); probably holds for Mac OS X too (but I don't have one to test on).

This commit allows the user to specify a subset of fonts to install e.g. ./install.ps1 fura-*,hack-* will install all the FuraMono and Hack fonts. Support for the -WhatIf parameter was also added so you can see what fonts would be installed (without actually installing the fonts).