Reimplemented bugfixes

This commit reimplements some important bugfixes that got lost in the Nodelike update. These include:
- Change in fs.js from position -1 to 0 when reading files ( see commit 05b61688982908bb10f38211ec410b62c90a7d3e )
- Change in fs.js where the same chunk was read over and over because the start was not initialized ( see commit 2b986319559f4d602ed412e27db744c150f26175 )
- Change in node.js that makes process.nextTick work ( see commit adc69c9a5211b7d9ec467182bf08fa976a92409f )