Fix legend options and handle alignment correctly
Fix legend options and handle alignment correctly

* fix "legend plot post" to "legend plot pos"
* add option "align" to correctly handle multiline nodes (see Chapter "17.4.3 Text Parameters: Alignment and Width for Multi-Line Text" of pgfmanual)
* remove wrong option "nodes"
* do not set "legend plot pos" explicitly, since default is 'left' and thus ok

RPeschke/matlab2tikz,okomarov/matlab2tikz,PeterPablo/matlab2tikz,miscco/matlab2tikz,egeerardyn/matlab2tikz,okomarov/matlab2tikz,matlab2tikz/matlab2tikz,nidrosianDeath/matlab2tikz,matlab2tikz/matlab2tikz,LJeub/matlab2tikz,egeerardyn/matlab2tikz