Added relation mathematical symbols

Added the following relation, binary operation, and set/logic symbols, and other symbolds listed in the link below that were not already present.

http://en.wikibooks.org/wiki/LaTeX/Mathematics#List_of_Mathematical_Symbols

Added relation symbols:

`\ll\gg\sqsubset\sqsubseteq\sqsupset\sqsupseteq\prec\preceq\succ\succeq\doteq\equiv\simeq\sim\parallel\nparallel\perp\asymp\vdash\smile\frown\bowtie\dashv\ni\mid`

Added binary operation symbols:

`\mp\ominus\uplus\sqcap\ast\sqcup\bigcirc\bullet\ddagger\wr\amalg`

Added set/logic notation symbols:

`\exists\nexists\forall\mapsto\implies\Rightarrow\leftrightarrow\iff\Leftrightarrow`

Added Greek letters:

`\varkappa`

Other symbols:

`\hbar\imath\jmath\ell\Re\Im\wp\nabla`

I tried to add `\eth\aleph\beth\gimel` with the following code, but they did not display how I expected them to, so I'm leaving them out for now.

	"\\eth": {
		font: "main",
		group: "textord",
		replace: "\u00f0"
	},
	"\\aleph": {
		font: "ams",
		group: "textord",
		replace: "\u05d0"
	},
	"\\beth": {
		font: "main",
		group: "textord",
		replace: "\u05d1"
	},
	"\\gimel": {
		font: "main",
		group: "textord",
		replace: "\u05d2"
	},

I don't completely understand when to use the `bin`, `textord` or `mathord` groups, could somebody explain that?
It looks to me like `\bullet` is a binary operator, so this isn't right. I didn't check the other symbols.