added markdown settings, updated plugins

LaTeX-Box @ 55a88ed5

-Subproject commit f4126633c6a4357e3eb9e757115621e6bb6cb97c
+Subproject commit 55a88ed55a7631b91321916cf80c47077d478c9c

airline @ 491b3335

-Subproject commit f45ecdac15d99ed2354873a8b4d40432fd0a85a3
+Subproject commit 491b3335cd20691ec2e1227faee2d04c3e176d8a

diffchar.vim @ 674ad04a

-Subproject commit d3932e2a68c957299761b91f9b4743ce60f93a46
+Subproject commit 674ad04a2c7ffe6c2f704a58e8cf8a5ae2254a05

eregex.vim @ e5ad9c56

-Subproject commit 455e328a18284769742da35f53e8b63350003e2d
+Subproject commit e5ad9c566c7e8410f9631db63a8b380ed8f19c7d

nerdtree @ af85499e

-Subproject commit 3b98a7fcae8f9fff356907171f0406ff8cd28921
+Subproject commit af85499edace2acca27ce41790ac333f62b689bb

syntastic @ 25ad02e1

-Subproject commit 9af644dace47bb6692dd7364eb066e50c5f710b9
+Subproject commit 25ad02e12d1b6715eb0e46e24163476631266525

vim-fugitive @ 935a2ccc

-Subproject commit 4cc201cbe3a0c3faa4cde1b82ba941d410e5e81c
+Subproject commit 935a2cccd3065b1322fb2235285d42728600afdf

ftplugin/markdown.vim

+setlocal colorcolumn=+1
+setlocal spell spelllang=en_gb
+
+autocmd CursorHold *.md w
+autocmd CursorHold *.markdown w
+
+highlight ColorColumn ctermbg=grey guibg=grey