Fix typos.

sync.js

@@ -58,7 +58,7 @@ sync.await = Fiber.yield
 
 // Creates fiber-aware asynchronous callback resuming current fiber when it will be finished.
 sync.defer = function(){
-  if(!Fiber.current) throw new Error("no current Fiber, defer can'b be used without Fiber!")
+  if(!Fiber.current) throw new Error("no current Fiber, defer can't be used without Fiber!")
   if(Fiber.current._syncParallel) return sync.deferParallel()
   else return sync.deferSerial()
 }
@@ -89,7 +89,7 @@ sync.deferWithTimeout = function(timeout, message){
 //
 sync.deferSerial = function(){
   var fiber = Fiber.current
-  if(!fiber) throw new Error("no current Fiber, defer can'b be used without Fiber!")
+  if(!fiber) throw new Error("no current Fiber, defer can't be used without Fiber!")
 
   // Returning asynchronous callback.
   return function(err, result){
@@ -109,7 +109,7 @@ sync.deferSerial = function(){
 
 sync.deferParallel = function(){
   var fiber = Fiber.current
-  if(!fiber) throw new Error("no current Fiber, defer can'b be used without Fiber!")
+  if(!fiber) throw new Error("no current Fiber, defer can't be used without Fiber!")
   if(!fiber._syncParallel) throw new Error("invalid usage, should be called in parallel mode!")
   var data = fiber._syncParallel
 
@@ -139,14 +139,14 @@ sync.deferParallel = function(){
 }
 
 sync.defers = function(){
-  if(!Fiber.current) throw new Error("no current Fiber, defer can'b be used without Fiber!")
+  if(!Fiber.current) throw new Error("no current Fiber, defer can't be used without Fiber!")
   if(Fiber.current._syncParallel) return sync.defersParallel.apply(sync, arguments)
   else return sync.defersSerial.apply(sync, arguments)
 }
 
 sync.defersSerial = function(){
   var fiber = Fiber.current;
-  if(!fiber) throw new Error("no current Fiber, defer can'b be used without Fiber!")
+  if(!fiber) throw new Error("no current Fiber, defer can't be used without Fiber!")
 
   var kwds = Array.prototype.slice.call(arguments)
   // Returning asynchronous callback.
@@ -176,7 +176,7 @@ sync.defersSerial = function(){
 
 sync.defersParallel = function(){
   var fiber = Fiber.current
-  if(!fiber) throw new Error("no current Fiber, defer can'b be used without Fiber!")
+  if(!fiber) throw new Error("no current Fiber, defer can't be used without Fiber!")
   if(!fiber._syncParallel) throw new Error("invalid usage, should be called in parallel mode!")
   var data = fiber._syncParallel
   // Counting amount of `defer` calls.
@@ -218,7 +218,7 @@ sync.defersParallel = function(){
 // performed in parallel.
 sync.parallel = function(cb){
   var fiber = Fiber.current
-  if(!fiber) throw new Error("no current Fiber, defer can'b be used without Fiber!")
+  if(!fiber) throw new Error("no current Fiber, defer can't be used without Fiber!")
 
   // Enabling `defer` calls to be performed in parallel.
   // There's an important note - error in any parallel call will result in aborting